20991090
20,991,090 is an even composite number composed of six prime numbers multiplied together.
20991090 is an even composite number. It is composed of six distinct prime numbers multiplied together. It has a total of sixty-four divisors.
Prime factorization of 20991090:
2 × 3 × 5 × 17 × 79 × 521
See below for interesting mathematical facts about the number 20991090 from the Numbermatics database.
Names of 20991090
- Cardinal: 20991090 can be written as Twenty million, nine hundred ninety-one thousand and ninety.
Scientific notation
- Scientific notation: 2.099109 × 107
Factors of 20991090
Divisors of 20991090
- Number of divisors d(n): 64
-
Complete list of divisors:
1 2 3 5 6 10 15 17 30 34 51 79 85 102 158 170 237 255 395 474 510 521 790 1042 1185 1343 1563 2370 2605 2686 3126 4029 5210 6715 7815 8058 8857 13430 15630 17714 20145 26571 40290 41159 44285 53142 82318 88570 123477 132855 205795 246954 265710 411590 617385 699703 1234770 1399406 2099109 3498515 4198218 6997030 10495545 20991090
- Sum of all divisors σ(n): 54120960
- Sum of proper divisors (its aliquot sum) s(n): 33129870
- 20991090 is an abundant number, because the sum of its proper divisors (33129870) is greater than itself. Its abundance is 12138780
Bases of 20991090
- Binary: 10100000001001100011100102
- Hexadecimal: 0x1404C72
- Base-36: CHWTU
Squares and roots of 20991090
- 20991090 squared (209910902) is 440625859388100
- 20991090 cubed (209910903) is 9249217070742952029000
-
The
square root of 20991090 is 4581.6034311145 -
The
cube root of 20991090 is 275.8533930479
Scales and comparisons
How big is 20991090?- 20,991,090 seconds is equal to 34 weeks, 4 days, 22 hours, 51 minutes, 30 seconds.
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To count from 1 to 20,991,090 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 20991090 cubic inches would be around 23 feet tall.
Recreational maths with 20991090
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The information we have on file for 20991090 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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