20999979

Names of 20999979

• Cardinal: 20999979 can be written as Twenty million, nine hundred ninety-nine thousand, nine hundred seventy-nine.

Scientific notation

• Scientific notation: 2.0999979 × 10⁷

Factors of 20999979

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 71

Divisors of 20999979

• Number of divisors d(n): 120
• Complete list of divisors:
  1 3 7 9 11 13 21 27 33 37 39 49 63 77 81 91 99 111 117 143 147 189 231 259 273 297 333 351 407 429 441 481 539 567 637 693 777 819 891 999 1001 1053 1221 1287 1323 1443 1617 1813 1911 2079 2331 2457 2849 2997 3003 3367 3663 3861 3969 4329 4851 5291 5439 5733 6237 6993 7007 7371 8547 9009 10101 10989 11583 12987 14553 15873 16317 17199 19943 20979 21021 23569 25641 27027 30303 32967 37037 38961 43659 47619 48951 51597 59829 63063 70707 76923 81081 90909 111111 142857 146853 179487 189189 212121 230769 259259 272727 333333 428571 538461 567567 636363 777777 999999 1615383 1909089 2333331 2999997 6999993 20999979
• Sum of all divisors σ(n): 44030448
• Sum of proper divisors (its aliquot sum) s(n): 23030469
• 20999979 is an abundant number, because the sum of its proper divisors (23030469) is greater than itself. Its abundance is 2030490

Bases of 20999979

• Binary: 1010000000110111100101011₂
• Hexadecimal: 0x1406F2B
• Base-36: CI3OR

Squares and roots of 20999979

• 20999979 squared (20999979²) is 440999118000441
• 20999979 cubed (20999979³) is 9260972217027782990739
• The square root of 20999979 is 4582.5734036675
• The cube root of 20999979 is 275.8923256739

Scales and comparisons

• 20,999,979 seconds is equal to 34 weeks, 5 days, 1 hour, 19 minutes, 39 seconds.
• To count from 1 to 20,999,979 would take you about thirteen 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 20999979 cubic inches would be around 23 feet tall.

Recreational maths with 20999979

• 20999979 backwards is 97999902
• The number of decimal digits it has is: 8
• The sum of 20999979's digits is 54
• More coming soon!