21801990
21,801,990 is an even composite number composed of seven prime numbers multiplied together.
21801990 is an even composite number. It is composed of seven distinct prime numbers multiplied together. It has a total of one hundred twenty-eight divisors.
Prime factorization of 21801990:
2 × 3 × 5 × 7 × 17 × 31 × 197
See below for interesting mathematical facts about the number 21801990 from the Numbermatics database.
Names of 21801990
- Cardinal: 21801990 can be written as Twenty-one million, eight hundred one thousand, nine hundred ninety.
Scientific notation
- Scientific notation: 2.180199 × 107
Factors of 21801990
Divisors of 21801990
- Number of divisors d(n): 128
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Complete list of divisors:
1 2 3 5 6 7 10 14 15 17 21 30 31 34 35 42 51 62 70 85 93 102 105 119 155 170 186 197 210 217 238 255 310 357 394 434 465 510 527 591 595 651 714 930 985 1054 1085 1182 1190 1302 1379 1581 1785 1970 2170 2635 2758 2955 3162 3255 3349 3570 3689 4137 5270 5910 6107 6510 6698 6895 7378 7905 8274 10047 11067 12214 13790 15810 16745 18321 18445 20094 20685 22134 23443 30535 33490 36642 36890 41370 42749 46886 50235 55335 61070 70329 85498 91605 100470 103819 110670 117215 128247 140658 183210 207638 213745 234430 256494 311457 351645 427490 519095 622914 641235 703290 726733 1038190 1282470 1453466 1557285 2180199 3114570 3633665 4360398 7267330 10900995 21801990
- Sum of all divisors σ(n): 65691648
- Sum of proper divisors (its aliquot sum) s(n): 43889658
- 21801990 is an abundant number, because the sum of its proper divisors (43889658) is greater than itself. Its abundance is 22087668
Bases of 21801990
- Binary: 10100110010101100000001102
- Hexadecimal: 0x14CAC06
- Base-36: CZAIU
Squares and roots of 21801990
- 21801990 squared (218019902) is 475326767960100
- 21801990 cubed (218019903) is 10363069441798420599000
-
The
square root of 21801990 is 4669.2601126945 -
The
cube root of 21801990 is 279.3607440339
Scales and comparisons
How big is 21801990?- 21,801,990 seconds is equal to 36 weeks, 8 hours, 6 minutes, 30 seconds.
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To count from 1 to 21,801,990 would take you about two weeks!
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 21801990 cubic inches would be around 23.3 feet tall.
Recreational maths with 21801990
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The information we have on file for 21801990 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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