21391920
21,391,920 is an even composite number composed of six prime numbers multiplied together.
21391920 is an even composite number. It is composed of six distinct prime numbers multiplied together. It has a total of two hundred forty divisors.
Prime factorization of 21391920:
24 × 32 × 5 × 11 × 37 × 73
(2 × 2 × 2 × 2 × 3 × 3 × 5 × 11 × 37 × 73)See below for interesting mathematical facts about the number 21391920 from the Numbermatics database.
Names of 21391920
- Cardinal: 21391920 can be written as Twenty-one million, three hundred ninety-one thousand, nine hundred twenty.
Scientific notation
- Scientific notation: 2.139192 × 107
Factors of 21391920
Divisors of 21391920
- Number of divisors d(n): 240
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Complete list of divisors:
1 2 3 4 5 6 8 9 10 11 12 15 16 18 20 22 24 30 33 36 37 40 44 45 48 55 60 66 72 73 74 80 88 90 99 110 111 120 132 144 146 148 165 176 180 185 198 219 220 222 240 264 292 296 330 333 360 365 370 396 407 438 440 444 495 528 555 584 592 657 660 666 720 730 740 792 803 814 876 880 888 990 1095 1110 1168 1221 1314 1320 1332 1460 1480 1584 1606 1628 1665 1752 1776 1980 2035 2190 2220 2409 2442 2628 2640 2664 2701 2920 2960 3212 3256 3285 3330 3504 3663 3960 4015 4070 4380 4440 4818 4884 5256 5328 5402 5840 6105 6424 6512 6570 6660 7227 7326 7920 8030 8103 8140 8760 8880 9636 9768 10512 10804 12045 12210 12848 13140 13320 13505 14454 14652 16060 16206 16280 17520 18315 19272 19536 21608 24090 24309 24420 26280 26640 27010 28908 29304 29711 32120 32412 32560 36135 36630 38544 40515 43216 48180 48618 48840 52560 54020 57816 58608 59422 64240 64824 72270 73260 81030 89133 96360 97236 97680 108040 115632 118844 121545 129648 144540 146520 148555 162060 178266 192720 194472 216080 237688 243090 267399 289080 293040 297110 324120 356532 388944 445665 475376 486180 534798 578160 594220 648240 713064 891330 972360 1069596 1188440 1336995 1426128 1782660 1944720 2139192 2376880 2673990 3565320 4278384 5347980 7130640 10695960 21391920
- Sum of all divisors σ(n): 81592992
- Sum of proper divisors (its aliquot sum) s(n): 60201072
- 21391920 is an abundant number, because the sum of its proper divisors (60201072) is greater than itself. Its abundance is 38809152
Bases of 21391920
- Binary: 10100011001101010001100002
- Hexadecimal: 0x1466A30
- Base-36: CQI40
Squares and roots of 21391920
- 21391920 squared (213919202) is 457614241286400
- 21391920 cubed (213919203) is 9789247240459365888000
-
The
square root of 21391920 is 4625.1399978811 -
The
cube root of 21391920 is 277.5981634695
Scales and comparisons
How big is 21391920?- 21,391,920 seconds is equal to 35 weeks, 2 days, 14 hours, 12 minutes.
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To count from 1 to 21,391,920 would take you about nine hours!
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 21391920 cubic inches would be around 23.1 feet tall.
Recreational maths with 21391920
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