21020940

Names of 21020940

• Cardinal: 21020940 can be written as Twenty-one million, twenty thousand, nine hundred forty.

Scientific notation

• Scientific notation: 2.102094 × 10⁷

Factors of 21020940

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 4066

Divisors of 21020940

• Number of divisors d(n): 72
• Complete list of divisors:
  1 2 3 4 5 6 9 10 12 15 18 20 29 30 36 45 58 60 87 90 116 145 174 180 261 290 348 435 522 580 870 1044 1305 1740 2610 4027 5220 8054 12081 16108 20135 24162 36243 40270 48324 60405 72486 80540 116783 120810 144972 181215 233566 241620 350349 362430 467132 583915 700698 724860 1051047 1167830 1401396 1751745 2102094 2335660 3503490 4204188 5255235 7006980 10510470 21020940
• Sum of all divisors σ(n): 65978640
• Sum of proper divisors (its aliquot sum) s(n): 44957700
• 21020940 is an abundant number, because the sum of its proper divisors (44957700) is greater than itself. Its abundance is 23936760

Bases of 21020940

• Binary: 1010000001100000100001100₂
• Hexadecimal: 0x140C10C
• Base-36: CIJV0

Squares and roots of 21020940

• 21020940 squared (21020940²) is 441879918483600
• 21020940 cubed (21020940³) is 9288731253648646584000
• The square root of 21020940 is 4584.8598669971
• The cube root of 21020940 is 275.9840885597

Scales and comparisons

• 21,020,940 seconds is equal to 34 weeks, 5 days, 7 hours, 9 minutes.
• To count from 1 to 21,020,940 would take you about twenty-two 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 21020940 cubic inches would be around 23 feet tall.

Recreational maths with 21020940

• 21020940 backwards is 04902012
• 21020940 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 21020940's digits is 18
• More coming soon!