20721218128

Names of 20721218128

• Cardinal: 20721218128 can be written as Twenty billion, seven hundred twenty-one million, two hundred eighteen thousand, one hundred twenty-eight.

Scientific notation

• Scientific notation: 2.0721218128 × 10¹⁰

Factors of 20721218128

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 10118

Divisors of 20721218128

• Number of divisors d(n): 80
• Complete list of divisors:
  1 2 4 8 13 16 17 26 34 52 68 104 136 208 221 272 442 619 884 1238 1768 2476 3536 4952 8047 9467 9904 10523 16094 18934 21046 32188 37868 42092 64376 75736 84184 123071 128752 136799 151472 160939 168368 246142 273598 321878 492284 547196 643756 984568 1094392 1287512 1969136 2092207 2188784 2575024 4184414 5860073 8368828 11720146 16737656 23440292 33475312 46880584 76180949 93761168 99621241 152361898 199242482 304723796 398484964 609447592 796969928 1218895184 1295076133 1593939856 2590152266 5180304532 10360609064 20721218128
• Sum of all divisors σ(n): 45857689920
• Sum of proper divisors (its aliquot sum) s(n): 25136471792
• 20721218128 is an abundant number, because the sum of its proper divisors (25136471792) is greater than itself. Its abundance is 4415253664

Bases of 20721218128

• Binary: 10011010011000101001011001001010000₂
• Hexadecimal: 0x4D314B250
• Base-36: 9IOVM8G

Squares and roots of 20721218128

• 20721218128 squared (20721218128²) is 429368880708155824384
• 20721218128 cubed (20721218128³) is 8897046234528907945674525233152
• The square root of 20721218128 is 143948.6649052363
• The cube root of 20721218128 is 2746.6612098371

Scales and comparisons

• 20,721,218,128 seconds is equal to 658 years, 45 weeks, 1 day, 21 hours, 55 minutes, 28 seconds.
• To count from 1 to 20,721,218,128 would take you about one thousand, three hundred seventeen years!

  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 20721218128 cubic inches would be around 228.9 feet tall.

Recreational maths with 20721218128

• 20721218128 backwards is 82181212702
• 20721218128 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 20721218128's digits is 34
• More coming soon!