20301094002851137944
20,301,094,002,851,137,944 is an even composite number composed of five prime numbers multiplied together.
What does the number 20301094002851137944 look like?
This visualization shows the relationship between its 5 prime factors (large circles) and 1800 divisors.
20301094002851137944 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of one thousand, eight hundred divisors.
Prime factorization of 20301094002851137944:
23 × 35 × 134 × 294 × 7192
(2 × 2 × 2 × 3 × 3 × 3 × 3 × 3 × 13 × 13 × 13 × 13 × 29 × 29 × 29 × 29 × 719 × 719)See below for interesting mathematical facts about the number 20301094002851137944 from the Numbermatics database.
Names of 20301094002851137944
- Cardinal: 20301094002851137944 can be written as Twenty quintillion, three hundred one quadrillion, ninety-four trillion, two billion, eight hundred fifty-one million, one hundred thirty-seven thousand, nine hundred forty-four.
Scientific notation
- Scientific notation: 2.0301094002851137944 × 1019
Factors of 20301094002851137944
Divisors of 20301094002851137944
- Number of divisors d(n): 1800
-
Complete list of divisors:
1 2 3 4 6 8 9 12 13 18 24 26 27 29 36 39 52 54 58 72 78 81 87 104 108 116 117 156 162 169 174 216 232 234 243 261 312 324 338 348 351 377 468 486 507 522 648 676 696 702 719 754 783 841 936 972 1014 1044 1053 1131 1352 1404 1438 1508 1521 1566 1682 1944 2028 2088 2106 2157 2197 2262 2349 2523 2808 2876 3016 3042 3132 3159 3364 3393 4056 4212 4314 4394 4524 4563 4698 4901 5046 5752 6084 6264 6318 6471 6591 6728 6786 7047 7569 8424 8628 8788 9048 9126 9347 9396 9802 10092 10179 10933 12168 12636 12942 13182 13572 13689 14094 14703 15138 17256 17576 18252 18694 18792 19413 19604 19773 20184 20358 20851 21866 22707 24389 25272 25884 26364 27144 27378 28041 28188 28561 29406 30276 30537 32799 36504 37388 38826 39208 39546 40716 41067 41702 43732 44109 45414 48778 51768 52728 54756 56082 56376 57122 58239 58812 59319 60552 61074 62553 63713 65598 68121 73167 74776 77652 79092 81432 82134 83404 84123 85683 87464 88218 90828 91611 97556 98397 109512 112164 114244 116478 117624 118638 121511 122148 125106 127426 131196 132327 136242 142129 146334 155304 158184 164268 166808 168246 171366 174717 176436 177957 181656 183222 187659 191139 195112 196794 204363 219501 224328 228488 232956 237276 243022 244296 250212 252369 254852 257049 262392 264654 271063 272484 284258 292668 295191 317057 328536 336492 342732 349434 352872 355914 364533 366444 375318 382278 393588 396981 408726 426387 439002 465912 474552 486044 500424 504738 509704 514098 516961 529308 533871 542126 544968 562977 568516 573417 585336 590382 604679 634114 658503 672984 685464 698868 707281 711828 729066 732888 750636 757107 764556 771147 787176 793962 813189 817452 828269 852774 878004 885573 951171 972088 1009476 1028196 1033922 1058616 1067742 1084252 1093599 1125954 1137032 1146834 1180764 1190943 1209358 1268228 1279161 1317006 1397736 1414562 1423656 1458132 1501272 1514214 1529112 1542294 1550883 1579643 1587924 1626378 1634904 1656538 1688931 1705548 1720251 1756008 1771146 1814037 1847677 1902342 1975509 2018952 2056392 2067844 2121843 2135484 2168504 2187198 2251908 2271321 2293668 2313441 2361528 2381886 2418716 2439567 2484807 2536456 2558322 2634012 2656719 2829124 2853513 2916264 3028428 3084588 3101766 3159286 3175848 3252756 3280797 3313076 3377862 3411096 3440502 3523819 3542292 3628074 3695354 3804684 3837483 3951018 4121741 4135688 4243686 4270968 4374396 4503816 4542642 4587336 4626882 4652649 4738929 4763772 4837432 4879134 4969614 5066793 5116644 5160753 5268024 5313438 5442111 5543031 5658248 5707026 5926527 6056856 6169176 6203532 6318572 6365529 6505512 6561594 6626152 6720493 6755724 6881004 6940323 7047638 7084584 7256148 7318701 7390708 7454421 7609368 7674966 7860827 7902036 8243482 8487372 8560539 8748792 9085284 9194653 9253764 9305298 9477858 9527544 9758268 9842391 9939228 10133586 10233288 10321506 10571457 10626876 10884222 11086062 11414052 11512449 11853054 12365223 12407064 12637144 12731058 13123188 13440986 13511448 13762008 13880646 13957947 14095276 14216787 14512296 14637402 14781416 14908842 14991869 15349932 15482259 15721654 15804072 16326333 16486964 16629093 16974744 17121078 17535691 18170568 18389306 18507528 18610596 18955716 19096587 19516536 19684782 19878456 20161479 20267172 20535359 20643012 21142914 21253752 21768444 21956103 22172124 22363263 22828104 23024898 23582481 23706108 24019801 24730446 25462116 25681617 26246376 26881972 27583959 27761292 27915894 28190552 28433574 29274804 29527173 29817684 29983738 30699864 30964518 31443308 31714371 32652666 32973928 33258186 34242156 34537347 35071382 36778612 37095669 37221192 37911432 38193174 39369564 40322958 40534344 41070718 41286024 41873841 42285828 42650361 43536888 43912206 44344248 44726526 44975607 45809647 46049796 47164962 47412216 48039602 48978999 49460892 49887279 50924232 51363234 52607073 53582633 53763944 55167918 55522584 55831788 56867148 57289761 58549608 59054346 59635368 59967476 60484437 61606077 61929036 62886616 63428742 65305332 65868309 66516372 67089789 68484312 69074694 70142764 70747443 72059403 73557224 74191338 76386348 77044851 78739128 80645916 82141436 82751877 83747682 84571656 85300722 87366409 87824412 89453052 89951214 91619294 92099592 94329924 95143113 96079204 97957998 98921784 99774558 102190751 102726468 105214146 107165266 110335836 111287007 111663576 113734296 114579522 118108692 119530489 119934952 120968874 123212154 123858072 125621523 126857484 127951083 130610664 131736618 133032744 134179578 134926821 137428941 138149388 140285528 141494886 144118806 146936997 148382676 149661837 152772696 154089702 157821219 160747899 161291832 164282872 165503754 167495364 170601444 171869283 174732818 175648824 178906104 179902428 181453311 183238588 184818231 188659848 190286226 192158408 194894297 195915996 199549116 201269367 204381502 205452936 210428292 212242329 214330532 216178209 220671672 222574014 227963983 229159044 236217384 239060978 241937748 246424308 248255631 251243046 253714968 255902166 262099227 263473236 268359156 269853642 274857882 276298776 282989772 285429339 288237612 293873994 296765352 299323674 306572253 308179404 315642438 321495798 331007508 333861021 334990728 341202888 343738566 349465636 358591467 359804856 362906622 366477176 369636462 380572452 383853249 389788594 391831992 399098232 402538734 404780463 408763004 412286823 420856584 424484658 428661064 432356418 434764201 445148028 448985511 455927966 458318088 473463657 478121956 482243697 483875496 492848616 496511262 502486092 508535039 511804332 524198454 526946472 536718312 539707284 544359933 549715764 554454693 565979544 570858678 576475224 584682891 587747988 595525411 598647348 613144506 616358808 631284876 636726987 642991596 648534627 662015016 667722042 683891949 687477132 696574229 698931272 717182934 725813244 739272924 744766893 761144904 767706498 779577188 786297681 805077468 809560926 817526008 824573646 848969316 856288017 864712836 869528402 890296056 897971022 911855932 919716759 946927314 956243912 964487394 993022524 1001583063 1004972184 1017070078 1023608664 1048396908 1075774401 1079414568 1088719866 1099431528 1108909386 1135763317 1141717356 1169365782 1175495976 1191050822 1197294696 1214341389 1226289012 1236860469 1262569752 1273453974 1285983192 1297069254 1304292603 1328479763 1335444084 1367783898 1374954264 1393148458 1420390971 1434365868 1446731091 1451626488 1478545848 1489533786 1525605117 1535412996 1553896357 1559154376 1572595362 1610154936 1619121852 1633079799 1649147292 1663364079 1697938632 1712576034 1729425672 1739056804 1754048673 1786576233 1795942044 1823711864 1839433518 1893854628 1910180961 1928974788 1945603881 1986045048 2003166126 2034140156 2051675847 2089722687 2096793816 2151548802 2177439732 2217818772 2234300679 2271526634 2283434712 2338731564 2358893043 2382101644 2428682778 2452578024 2473720938 2533625861 2546907948 2594138508 2608585206 2656959526 2670888168 2735567796 2759150277 2786296916 2840781942 2868731736 2893462182 2963531779 2979067572 3051210234 3070825992 3107792714 3145190724 3227323203 3238243704 3266159598 3298294584 3326728158 3407289951 3425152068 3478113608 3508097346 3573152466 3591884088 3643024167 3678867036 3710581407 3787709256 3820361922 3857949576 3891207762 3912877809 3985439289 4006332252 4068280312 4103351694 4179445374 4261172913 4303097604 4340193273 4354879464 4435637544 4468601358 4543053268 4576815351 4661689071 4677463128 4717786086 4764203288 4857365556 4947441876 4990092237 5067251722 5093815896 5188277016 5217170412 5262146019 5313919052 5359728699 5471135592 5518300554 5572593832 5651934613 5681563884 5786924364 5836811643 5927063558 5958135144 6102420468 6155027541 6215585428 6269168061 6290381448 6454646406 6532319196 6610955507 6653456316 6814579902 6850304136 7016194692 7076679129 7146304932 7286048334 7357734072 7421162814 7600877583 7640723844 7782415524 7825755618 7970878578 8012664504 8206703388 8277450831 8358890748 8522345826 8606195208 8680386546 8890595337 8937202716 9086106536 9153630702 9323378142 9435572172 9681969609 9714731112 9894883752 9980184474 10134503444 10221869853 10434340824 10524292038 10627838104 10719457398 11036601108 11131744221 11303869226 11363127768 11573848728 11673623286 11738633427 11854127116 11956317867 12204840936 12310055082 12431170856 12538336122 12608161829 12909292812 13020579819 13064638392 13221911014 13306912632 13629159804 13730446053 13985067213 14032389384 14153358258 14292609864 14572096668 14764923121 14842325628 15201755166 15281447688 15564831048 15651511236 15786438057 15941757156 16079186097 16413406776 16554901662 16717781496 16955803839 17044691652 17270236919 17360773092 17781190674 17874405432 18307261404 18465082623 18646756284 18807504183 18871144344 19363939218 19832866521 19960368948 20200652641 20269006888 20443739706 21048584076 21230037387 21438914796 22073202216 22263488442 22607738452 22802632749 23347246572 23477266854 23708254232 23912635734 24620110164 24832352493 25076672244 25216323658 25818585624 26041159638 26443822028 26671786011 27258319608 27460892106 27970134426 28306716516 29045908827 29144193336 29529846242 29684651256 30403510332 30665609559 31303022472 31572876114 31883514312 32158372194 32937136193 33109803324 33911607678 34089383304 34540473838 34721546184 35215900281 35562381348 35868953601 36614522808 36930165246 37293512568 37615008366 37824485487 38525913127 38727878436 39665733042 39920737896 40401305282 40887479412 41191338159 41955201639 42097168152 42460074774 42877829592 44294769363 44526976884 45215476904 45605265498 46694493144 46954533708 47359314171 47825271468 48237558291 49240220328 49664704986 50153344488 50432647316 50867411517 51810710757 52082319276 52887644056 53343572022 54921784212 55395247869 55940268852 56422512549 56613433032 58091817654 59059692484 59498599563 60601957923 60807020664 61331219118 63145752228 64316744388 65874272386 66219606648 67823215356 68407898247 69080947676 70431800562 71124762696 71737907202 73475149969 73860330492 75230016732 75648970974 77051826254 77455756872 79331466084 80015358033 80802610564 81774958824 82382676318 83910403278 84920149548 85942421591 88589538726 89053953768 91210530996 91996828677 93909067416 94718628342 95650542936 96475116582 98811408579 99329409972 100865294632 101734823034 103621421514 104164638552 105647700843 106687144044 107606860803 109843568424 110790495738 111880537704 112845025098 113473456461 115577739381 116183635308 118119384968 118997199126 121203915846 122662438236 123574014477 125865604917 126291504456 128633488776 131748544772 132884308089 135646430712 136815796494 138161895352 140863601124 143475814404 144712674873 146950299938 147720660984 150460033464 151297941948 152602234551 154103652508 155432132271 158662932168 160030716066 161605221128 163906103777 164765352636 167820806556 169267537647 169840299096 171884843182 177179077452 178495798689 181805873769 182421061992 183993657354 189437256684 192950233164 197622817158 198658819944 203469646068 205223694741 207242843028 211295401686 213374288088 215213721606 220425449907 221580991476 225690050196 226946912922 231155478762 232367270616 237994398252 240046074099 242407831692 245324876472 247148028954 251731209834 257827264773 263497089544 265768616178 273631592988 275990486031 281727202248 286951628808 289425349746 293900599876 296434225737 302595883896 305204469102 308207305016 310864264542 320061432132 322820582409 327812207554 329530705272 335641613112 338535075294 340420369383 343769686364 346733218143 354358154904 356991597378 363611747538 365636693041 367987314708 377596814751 378874513368 385900466328 395245634316 398652924267 406939292136 410447389482 414485686056 422590803372 428182770509 430427443212 440850899814 443161982952 451380100392 453893825844 457806703653 462310957524 466296396813 475988796504 480092148198 484815663384 491718311331 494296057908 500836870651 503462419668 515654529546 531537232356 535487396067 545417621307 547263185976 551980972062 578850699492 587801199752 592868451474 610408938204 615671084223 621728529084 640122864264 645641164818 655624415108 661276349721 677070150588 680840738766 687539372728 693466436286 713983194756 720138222297 727223495076 731273386082 735974629416 755193629502 773481794319 790491268632 797305848534 820894778964 845181606744 856365541018 860854886424 881701799628 889302677211 907787651688 915613407306 924621915048 932592793626 955176949597 960184296396 983436622662 988592115816 1001673741302 1006924839336 1021261108149 1031309059092 1040199654429 1063074464712 1070974792134 1090835242614 1096910079123 1103961944124 1117251480683 1157701398984 1185736902948 1195958772801 1220817876408 1231342168446 1243457058168 1284548311527 1291282329636 1311248830216 1322552699442 1354140301176 1361681477532 1373420110959 1386932872572 1398889190439 1427966389512 1440276444594 1454446990152 1462546772164 1475154933993 1502510611953 1510387259004 1546963588638 1594611697068 1606462188201 1636252863921 1641789557928 1712731082036 1763403599256 1778605354422 1831226814612 1865185587252 1910353899194 1920368592792 1966873245324 1983829049163 2003347482604 2042522216298 2062618118184 2080399308858 2130779349101 2141949584268 2181670485228 2193820158246 2207923888248 2234502961366 2320445382957 2371473805896 2391917545602 2462684336892 2569096623054 2582564659272 2645105398884 2667908031633 2723362955064 2746840221918 2773865745144 2797778380878 2865530848791 2880552889188 2925093544328 2950309867986 3005021223906 3020774518008 3063783324447 3093927177276 3120598963287 3189223394136 3212924376402 3272505727842 3290730237369 3351754442049 3425462164072 3557210708844 3587876318403 3662453629224 3730371174504 3820707798388 3853644934581 3933746490648 3967658098326 4006694965208 4085044432596 4160798617716 4196667571317 4261558698202 4283899168536 4363340970456 4387640316492 4425464801979 4469005922732 4507531835859 4640890765914 4753277009533 4783835091204 4908758591763 4925368673784 5138193246108 5290210797768 5335816063266 5493680443836 5595556761756 5731061697582 5761105778376 5900619735972 5951487147489 6010042447812 6127566648894 6187854354552 6241197926574 6392338047303 6425848752804 6545011455684 6581460474738 6703508884098 6961336148871 7114421417688 7175752636806 7641415596776 7707289869162 7935316196652 8003724094899 8170088865192 8321597235432 8393335142634 8523117396404 8596592546373 8775280632984 8850929603958 8938011845464 9015063671718 9281781531828 9361796889861 9506554019066 9567670182408 9817517183526 9872190712107 10055263326147 10276386492216 10671632126532 10987360887672 11191113523512 11462123395164 11560934803743 11801239471944 11902974294978 12020084895624 12255133297788 12417300344761 12482395853148 12784676094606 12851697505608 13090022911368 13162920949476 13276394405937 13407017768196 13522595507577 13922672297742 14259831028599 14351505273612 14524269248879 15414579738324 15870632393304 16007448189798 16786670285268 17046234792808 17193185092746 17701859207916 17854461442467 18030127343436 18563563063656 18723593779722 19013108038132 19177014141909 19635034367052 19744381424214 20110526652294 20884008446613 21343264253064 22924246790328 23121869607486 23805948589956 24510266595576 24834600689522 24964791706296 25569352189212 25789777639119 26325841898952 26552788811874 26814035536392 27045191015154 27700131538313 27845344595484 28519662057198 28703010547224 29048538497758 29616572136321 30165789978441 30829159476648 32014896379596 33573340570536 34386370185492 34682804411229 35403718415832 35708922884934 36060254686872 37251901034283 37447187559444 38026216076264 38354028283818 39270068734104 39488762848428 39829183217811 40221053304588 40567786522731 41768016893226 42779493085797 43572807746637 46243739214972 47611897179912 49669201379044 51138704378424 51579555278238 53105577623748 54090382030308 55400263076626 55690689190968 57039324114396 57531042425727 58097076995516 59233144272642 60331579956882 61792601123929 64029792759192 68772740370984 69365608822458 71417845769868 74503802068566 74894375118888 76708056567636 77369332917357 78977525696856 79658366435622 80442106609176 81135573045462 83100394614939 83536033786452 85558986171594 87145615493274 88849716408963 90497369935323 92487478429944 99338402758088 103159110556476 104048413233687 106211155247496 108180764060616 110800526153252 111755703102849 114078648228792 115062084851454 116194153991032 118466288545284 120663159913764 121703359568193 123585202247858 128338479257391 130718423239911 138731217644916 142835691539736 149007604137132 153416113135272 154738665834714 159316732871244 162271146090924 166200789229878 167072067572904 171117972343188 172593127277181 174291230986548 177699432817926 180994739870646 185377803371787 206318221112952 208096826467374 221601052306504 223511406205698 230124169702908 232107998752071 236932577090568 241326319827528 243406719136386 247170404495716 249301183844817 256676958514782 261436846479822 271492109805969 277462435289832 298015208274264 309477331669428 318633465742488 324542292181848 332401578459756 335267109308547 342235944686376 345186254554362 348582461973096 355398865635852 360101709998069 361989479741292 370755606743574 385015437772173 392155269719733 416193652934748 447022812411396 460248339405816 464215997504142 486813438272772 494340808991432 498602367689634 513353917029564 517779381831543 522873692959644 542984219611938 556133410115361 618954663338856 664803156919512 670534218617094 690372509108724 710797731271704 720203419996138 723978959482584 741511213487148 747903551534451 770030875544346 784310539439466 803303814611077 832387305869496 894045624822792 928431995008284 973626876545544 997204735379268 1005801327925641 1026707834059128 1035558763663086 1045747385919288 1080305129994207 1085968439223876 1112266820230722 1155046313316519 1176465809159199 1341068437234188 1380745018217448 1440406839992276 1483022426974296 1495807103068902 1540061751088692 1568621078878932 1606607629222154 1668400230346083 1856863990016568 1994409470758536 2011602655851282 2071117527326172 2160610259988414 2171936878447752 2224533640461444 2243710654603353 2310092626633038 2352931618318398 2409911443833231 2682136874468376 2880813679984552 2991614206137804 3017403983776923 3080123502177384 3137242157757864 3213215258444308 3240915389982621 3336800460692166 3529397427477597 4023205311702564 4142235054652344 4321220519976828 4449067280922888 4487421309206706 4620185253266076 4705863236636796 4819822887666462 5005200691038249 5983228412275608 6034807967553846 6426430516888616 6481830779965242 6673600921384332 6731131963810059 7058794854955194 7229734331499693 8046410623405128 8642441039953656 8974842618413412 9240370506532152 9411726473273592 9639645775332924 9722746169947863 10010401382076498 10442949589944001 12069615935107692 12963661559930484 13347201842768664 13462263927620118 14117589709910388 14459468662999386 15015602073114747 17949685236826824 19279291550665848 19445492339895726 20020802764152996 20885899179888002 21689202994499079 24139231870215384 25927323119860968 26924527855240236 28235179419820776 28918937325998772 29168238509843589 30031204146229494 31328848769832003 38890984679791452 40041605528305992 41771798359776004 43378405988998158 53849055710480472 57837874651997544 58336477019687178 60062408292458988 62657697539664006 65067608983497237 77781969359582904 83543596719552008 86756811977996316 87504715529530767 93986546309496009 116672954039374356 120124816584917976 125315395079328012 130135217966994474 173513623955992632 175009431059061534 187973092618992018 195202826950491711 233345908078748712 250630790158656024 260270435933988948 281959638928488027 350018862118123068 375946185237984036 390405653900983422 520540871867977896 563919277856976054 700037724236246136 751892370475968072 780811307801966844 845878916785464081 1127838555713952108 1561622615603933688 1691757833570928162 2255677111427904216 2537636750356392243 3383515667141856324 5075273500712784486 6767031334283712648 10150547001425568972 20301094002851137944
- Sum of all divisors σ(n): 64065047314430859060
- Sum of proper divisors (its aliquot sum) s(n): 43763953311579721116
- 20301094002851137944 is an abundant number, because the sum of its proper divisors (43763953311579721116) is greater than itself. Its abundance is 23462859308728583172
Bases of 20301094002851137944
- Binary: 100011001101110111111100101101111100011111100000101001001100110002
- Hexadecimal: 0x119BBF96F8FC14998
- Base-36: 4A8KP7VBRC1I0
Squares and roots of 20301094002851137944
- 20301094002851137944 squared (203010940028511379442) is 412134417712598438824350459575716547136
- 20301094002851137944 cubed (203010940028511379443) is 8366779555793777967195123264557090087213530372528114128384
-
The
square root of 20301094002851137944 is 4505673534.8725764003 -
The
cube root of 20301094002851137944 is 2727971.4074526571
Scales and comparisons
How big is 20301094002851137944?- 20,301,094,002,851,137,944 seconds is equal to 293,274,701,009 years, 3 weeks, 3 days, 15 hours, 30 minutes, 7 seconds.
-
To count from 1 to 20,301,094,002,851,137,944 would take you about two hundred ninety-three billion, two hundred seventy-four million, seven hundred one thousand and nine years!
This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)
- A cube with a volume of 20301094002851137944 cubic inches would be around 227331 feet tall.
Recreational maths with 20301094002851137944
- 20301094002851137944 backwards is 44973115820049010302
- The number of decimal digits it has is: 20
- The sum of 20301094002851137944's digits is 63
- More coming soon!
Link to this page
HTML: To link to this page, just copy and paste the link below into your blog, web page or email.
BBCODE: To link to this page in a forum post or comment box, just copy and paste the link code below:
Cite this page
MLA style:
"Number 20301094002851137944 - Facts about the integer". Numbermatics.com. 2024. Web. 3 June 2024.
APA style:
Numbermatics. (2024). Number 20301094002851137944 - Facts about the integer. Retrieved 3 June 2024, from https://numbermatics.com/n/20301094002851137944/
Chicago style:
Numbermatics. 2024. "Number 20301094002851137944 - Facts about the integer". https://numbermatics.com/n/20301094002851137944/
The information we have on file for 20301094002851137944 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!
Keywords: Divisors of 20301094002851137944, math, Factors of 20301094002851137944, curriculum, school, college, exams, university, Prime factorization of 20301094002851137944, STEM, science, technology, engineering, physics, economics, calculator, twenty quintillion, three hundred one quadrillion, ninety-four trillion, two billion, eight hundred fifty-one million, one hundred thirty-seven thousand, nine hundred forty-four.