21720864
21,720,864 is an even composite number composed of five prime numbers multiplied together.
21720864 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of ninety-six divisors.
Prime factorization of 21720864:
25 × 3 × 11 × 67 × 307
(2 × 2 × 2 × 2 × 2 × 3 × 11 × 67 × 307)See below for interesting mathematical facts about the number 21720864 from the Numbermatics database.
Names of 21720864
- Cardinal: 21720864 can be written as Twenty-one million, seven hundred twenty thousand, eight hundred sixty-four.
Scientific notation
- Scientific notation: 2.1720864 × 107
Factors of 21720864
Divisors of 21720864
- Number of divisors d(n): 96
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Complete list of divisors:
1 2 3 4 6 8 11 12 16 22 24 32 33 44 48 66 67 88 96 132 134 176 201 264 268 307 352 402 528 536 614 737 804 921 1056 1072 1228 1474 1608 1842 2144 2211 2456 2948 3216 3377 3684 4422 4912 5896 6432 6754 7368 8844 9824 10131 11792 13508 14736 17688 20262 20569 23584 27016 29472 35376 40524 41138 54032 61707 70752 81048 82276 108064 123414 162096 164552 226259 246828 324192 329104 452518 493656 658208 678777 905036 987312 1357554 1810072 1974624 2715108 3620144 5430216 7240288 10860432 21720864
- Sum of all divisors σ(n): 63334656
- Sum of proper divisors (its aliquot sum) s(n): 41613792
- 21720864 is an abundant number, because the sum of its proper divisors (41613792) is greater than itself. Its abundance is 19892928
Bases of 21720864
- Binary: 10100101101101111001000002
- Hexadecimal: 0x14B6F20
- Base-36: CXJXC
Squares and roots of 21720864
- 21720864 squared (217208642) is 471795932906496
- 21720864 cubed (217208643) is 10247815294415124332544
-
The
square root of 21720864 is 4660.5647726429 -
The
cube root of 21720864 is 279.0138095195
Scales and comparisons
How big is 21720864?- 21,720,864 seconds is equal to 35 weeks, 6 days, 9 hours, 34 minutes, 24 seconds.
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To count from 1 to 21,720,864 would take you about six 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 21720864 cubic inches would be around 23.3 feet tall.
Recreational maths with 21720864
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