20815740

Names of 20815740

• Cardinal: 20815740 can be written as Twenty million, eight hundred fifteen thousand, seven hundred forty.

Scientific notation

• Scientific notation: 2.081574 × 10⁷

Factors of 20815740

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 10534

Divisors of 20815740

• Number of divisors d(n): 72
• Complete list of divisors:
  1 2 3 4 5 6 9 10 11 12 15 18 20 22 30 33 36 44 45 55 60 66 90 99 110 132 165 180 198 220 330 396 495 660 990 1980 10513 21026 31539 42052 52565 63078 94617 105130 115643 126156 157695 189234 210260 231286 315390 346929 378468 462572 473085 578215 630780 693858 946170 1040787 1156430 1387716 1734645 1892340 2081574 2312860 3469290 4163148 5203935 6938580 10407870 20815740
• Sum of all divisors σ(n): 68887728
• Sum of proper divisors (its aliquot sum) s(n): 48071988
• 20815740 is an abundant number, because the sum of its proper divisors (48071988) is greater than itself. Its abundance is 27256248

Bases of 20815740

• Binary: 1001111011001111101111100₂
• Hexadecimal: 0x13D9F7C
• Base-36: CE5J0

Squares and roots of 20815740

• 20815740 squared (20815740²) is 433295031747600
• 20815740 cubed (20815740³) is 9019356724149787224000
• The square root of 20815740 is 4562.4269857171
• The cube root of 20815740 is 275.0831263853

Scales and comparisons

• 20,815,740 seconds is equal to 34 weeks, 2 days, 22 hours, 9 minutes.
• To count from 1 to 20,815,740 would take you about fifty-one 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 20815740 cubic inches would be around 22.9 feet tall.

Recreational maths with 20815740

• 20815740 backwards is 04751802
• The number of decimal digits it has is: 8
• The sum of 20815740's digits is 27
• More coming soon!