21386820
21,386,820 is an even composite number composed of six prime numbers multiplied together.
21386820 is an even composite number. It is composed of six distinct prime numbers multiplied together. It has a total of ninety-six divisors.
Prime factorization of 21386820:
22 × 3 × 5 × 7 × 13 × 3917
(2 × 2 × 3 × 5 × 7 × 13 × 3917)See below for interesting mathematical facts about the number 21386820 from the Numbermatics database.
Names of 21386820
- Cardinal: 21386820 can be written as Twenty-one million, three hundred eighty-six thousand, eight hundred twenty.
Scientific notation
- Scientific notation: 2.138682 × 107
Factors of 21386820
Divisors of 21386820
- Number of divisors d(n): 96
-
Complete list of divisors:
1 2 3 4 5 6 7 10 12 13 14 15 20 21 26 28 30 35 39 42 52 60 65 70 78 84 91 105 130 140 156 182 195 210 260 273 364 390 420 455 546 780 910 1092 1365 1820 2730 3917 5460 7834 11751 15668 19585 23502 27419 39170 47004 50921 54838 58755 78340 82257 101842 109676 117510 137095 152763 164514 203684 235020 254605 274190 305526 329028 356447 411285 509210 548380 611052 712894 763815 822570 1018420 1069341 1425788 1527630 1645140 1782235 2138682 3055260 3564470 4277364 5346705 7128940 10693410 21386820
- Sum of all divisors σ(n): 73721088
- Sum of proper divisors (its aliquot sum) s(n): 52334268
- 21386820 is an abundant number, because the sum of its proper divisors (52334268) is greater than itself. Its abundance is 30947448
Bases of 21386820
- Binary: 10100011001010110010001002
- Hexadecimal: 0x1465644
- Base-36: CQE6C
Squares and roots of 21386820
- 21386820 squared (213868202) is 457396069712400
- 21386820 cubed (213868203) is 9782247411646550568000
-
The
square root of 21386820 is 4624.5886303541 -
The
cube root of 21386820 is 277.5761011963
Scales and comparisons
How big is 21386820?- 21,386,820 seconds is equal to 35 weeks, 2 days, 12 hours, 47 minutes.
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To count from 1 to 21,386,820 would take you about seven 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 21386820 cubic inches would be around 23.1 feet tall.
Recreational maths with 21386820
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The information we have on file for 21386820 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!
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