20991438720

Names of 20991438720

• Cardinal: 20991438720 can be written as Twenty billion, nine hundred ninety-one million, four hundred thirty-eight thousand, seven hundred twenty.

Scientific notation

• Scientific notation: 2.099143872 × 10¹⁰

Factors of 20991438720

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 12
• Sum of prime factors: 520638

Divisors of 20991438720

• Number of divisors d(n): 192
• Complete list of divisors:
  1 2 3 4 5 6 7 8 9 10 12 14 15 16 18 20 21 24 28 30 32 35 36 40 42 45 48 56 60 63 64 70 72 80 84 90 96 105 112 120 126 128 140 144 160 168 180 192 210 224 240 252 280 288 315 320 336 360 384 420 448 480 504 560 576 630 640 672 720 840 896 960 1008 1120 1152 1260 1344 1440 1680 1920 2016 2240 2520 2688 2880 3360 4032 4480 5040 5760 6720 8064 10080 13440 20160 40320 520621 1041242 1561863 2082484 2603105 3123726 3644347 4164968 4685589 5206210 6247452 7288694 7809315 8329936 9371178 10412420 10933041 12494904 14577388 15618630 16659872 18221735 18742356 20824840 21866082 23427945 24989808 29154776 31237260 32799123 33319744 36443470 37484712 41649680 43732164 46855890 49979616 54665205 58309552 62474520 65598246 66639488 72886940 74969424 83299360 87464328 93711780 99959232 109330410 116619104 124949040 131196492 145773880 149938848 163995615 166598720 174928656 187423560 199918464 218660820 233238208 249898080 262392984 291547760 299877696 327991230 333197440 349857312 374847120 437321640 466476416 499796160 524785968 583095520 599755392 655982460 699714624 749694240 874643280 999592320 1049571936 1166191040 1311964920 1399429248 1499388480 1749286560 2099143872 2332382080 2623929840 2998776960 3498573120 4198287744 5247859680 6997146240 10495719360 20991438720
• Sum of all divisors σ(n): 82841372640
• Sum of proper divisors (its aliquot sum) s(n): 61849933920
• 20991438720 is an abundant number, because the sum of its proper divisors (61849933920) is greater than itself. Its abundance is 40858495200

Bases of 20991438720

• Binary: 10011100011001011111110111110000000₂
• Hexadecimal: 0x4E32FEF80
• Base-36: 9N5RDS0

Squares and roots of 20991438720

• 20991438720 squared (20991438720²) is 440640499535515238400
• 20991438720 cubed (20991438720³) is 9249678043549956590499790848000
• The square root of 20991438720 is 144884.2252282835
• The cube root of 20991438720 is 2758.5492060177

Scales and comparisons

• 20,991,438,720 seconds is equal to 667 years, 24 weeks, 11 hours, 12 minutes.
• To count from 1 to 20,991,438,720 would take you about one thousand, three hundred thirty-four 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 20991438720 cubic inches would be around 229.9 feet tall.

Recreational maths with 20991438720

• 20991438720 backwards is 02783419902
• 20991438720 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 20991438720's digits is 45
• More coming soon!