21393720
21,393,720 is an even composite number composed of five prime numbers multiplied together.
21393720 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of one hundred ninety-two divisors.
Prime factorization of 21393720:
23 × 35 × 5 × 31 × 71
(2 × 2 × 2 × 3 × 3 × 3 × 3 × 3 × 5 × 31 × 71)See below for interesting mathematical facts about the number 21393720 from the Numbermatics database.
Names of 21393720
- Cardinal: 21393720 can be written as Twenty-one million, three hundred ninety-three thousand, seven hundred twenty.
Scientific notation
- Scientific notation: 2.139372 × 107
Factors of 21393720
Divisors of 21393720
- Number of divisors d(n): 192
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Complete list of divisors:
1 2 3 4 5 6 8 9 10 12 15 18 20 24 27 30 31 36 40 45 54 60 62 71 72 81 90 93 108 120 124 135 142 155 162 180 186 213 216 243 248 270 279 284 310 324 355 360 372 405 426 465 486 540 558 568 620 639 648 710 744 810 837 852 930 972 1065 1080 1116 1215 1240 1278 1395 1420 1620 1674 1704 1860 1917 1944 2130 2201 2232 2430 2511 2556 2790 2840 3195 3240 3348 3720 3834 4185 4260 4402 4860 5022 5112 5580 5751 6390 6603 6696 7533 7668 8370 8520 8804 9585 9720 10044 11005 11160 11502 12555 12780 13206 15066 15336 16740 17253 17608 19170 19809 20088 22010 23004 25110 25560 26412 28755 30132 33015 33480 34506 37665 38340 39618 44020 46008 50220 52824 57510 59427 60264 66030 69012 75330 76680 79236 86265 88040 99045 100440 115020 118854 132060 138024 150660 158472 172530 178281 198090 230040 237708 264120 297135 301320 345060 356562 396180 475416 534843 594270 690120 713124 792360 891405 1069686 1188540 1426248 1782810 2139372 2377080 2674215 3565620 4278744 5348430 7131240 10696860 21393720
- Sum of all divisors σ(n): 75479040
- Sum of proper divisors (its aliquot sum) s(n): 54085320
- 21393720 is an abundant number, because the sum of its proper divisors (54085320) is greater than itself. Its abundance is 32691600
Bases of 21393720
- Binary: 10100011001110001001110002
- Hexadecimal: 0x1467138
- Base-36: CQJI0
Squares and roots of 21393720
- 21393720 squared (213937202) is 457691255438400
- 21393720 cubed (213937203) is 9791718565297606848000
-
The
square root of 21393720 is 4625.3345824923 -
The
cube root of 21393720 is 277.6059493171
Scales and comparisons
How big is 21393720?- 21,393,720 seconds is equal to 35 weeks, 2 days, 14 hours, 42 minutes.
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To count from 1 to 21,393,720 would take you about ten 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 21393720 cubic inches would be around 23.1 feet tall.
Recreational maths with 21393720
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