21157920
21,157,920 is an even composite number composed of five prime numbers multiplied together.
21157920 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of one hundred forty-four divisors.
Prime factorization of 21157920:
25 × 32 × 5 × 7 × 2099
(2 × 2 × 2 × 2 × 2 × 3 × 3 × 5 × 7 × 2099)See below for interesting mathematical facts about the number 21157920 from the Numbermatics database.
Names of 21157920
- Cardinal: 21157920 can be written as Twenty-one million, one hundred fifty-seven thousand, nine hundred twenty.
Scientific notation
- Scientific notation: 2.115792 × 107
Factors of 21157920
Divisors of 21157920
- Number of divisors d(n): 144
-
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 70 72 80 84 90 96 105 112 120 126 140 144 160 168 180 210 224 240 252 280 288 315 336 360 420 480 504 560 630 672 720 840 1008 1120 1260 1440 1680 2016 2099 2520 3360 4198 5040 6297 8396 10080 10495 12594 14693 16792 18891 20990 25188 29386 31485 33584 37782 41980 44079 50376 58772 62970 67168 73465 75564 83960 88158 94455 100752 117544 125940 132237 146930 151128 167920 176316 188910 201504 220395 235088 251880 264474 293860 302256 335840 352632 377820 440790 470176 503760 528948 587720 604512 661185 705264 755640 881580 1007520 1057896 1175440 1322370 1410528 1511280 1763160 2115792 2350880 2644740 3022560 3526320 4231584 5289480 7052640 10578960 21157920
- Sum of all divisors σ(n): 82555200
- Sum of proper divisors (its aliquot sum) s(n): 61397280
- 21157920 is an abundant number, because the sum of its proper divisors (61397280) is greater than itself. Its abundance is 40239360
Bases of 21157920
- Binary: 10100001011011000001000002
- Hexadecimal: 0x142D820
- Base-36: CLHK0
Squares and roots of 21157920
- 21157920 squared (211579202) is 447657578726400
- 21157920 cubed (211579203) is 9471503238086873088000
-
The
square root of 21157920 is 4599.7739074871 -
The
cube root of 21157920 is 276.5822616351
Scales and comparisons
How big is 21157920?- 21,157,920 seconds is equal to 34 weeks, 6 days, 21 hours, 12 minutes.
-
To count from 1 to 21,157,920 would take you about three days!
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 21157920 cubic inches would be around 23 feet tall.
Recreational maths with 21157920
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The information we have on file for 21157920 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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