20421720

Names of 20421720

• Cardinal: 20421720 can be written as Twenty million, four hundred twenty-one thousand, seven hundred twenty.

Scientific notation

• Scientific notation: 2.042172 × 10⁷

Factors of 20421720

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 11
• Sum of prime factors: 212

Divisors of 20421720

• Number of divisors d(n): 192
• Complete list of divisors:
  1 2 3 4 5 6 8 9 10 11 12 15 18 20 22 24 27 30 33 36 40 44 45 54 55 60 66 72 81 88 90 99 108 110 120 132 135 162 165 180 191 198 216 220 243 264 270 297 324 330 360 382 396 405 440 486 495 540 573 594 648 660 764 792 810 891 955 972 990 1080 1146 1188 1215 1320 1485 1528 1620 1719 1782 1910 1944 1980 2101 2292 2376 2430 2673 2865 2970 3240 3438 3564 3820 3960 4202 4455 4584 4860 5157 5346 5730 5940 6303 6876 7128 7640 8404 8595 8910 9720 10314 10505 10692 11460 11880 12606 13365 13752 15471 16808 17190 17820 18909 20628 21010 21384 22920 25212 25785 26730 30942 31515 34380 35640 37818 41256 42020 46413 50424 51570 53460 56727 61884 63030 68760 75636 77355 84040 92826 94545 103140 106920 113454 123768 126060 151272 154710 170181 185652 189090 206280 226908 232065 252120 283635 309420 340362 371304 378180 453816 464130 510543 567270 618840 680724 756360 850905 928260 1021086 1134540 1361448 1701810 1856520 2042172 2269080 2552715 3403620 4084344 5105430 6807240 10210860 20421720
• Sum of all divisors σ(n): 75479040
• Sum of proper divisors (its aliquot sum) s(n): 55057320
• 20421720 is an abundant number, because the sum of its proper divisors (55057320) is greater than itself. Its abundance is 34635600

Bases of 20421720

• Binary: 1001101111001110001011000₂
• Hexadecimal: 0x1379C58
• Base-36: C5PI0

Squares and roots of 20421720

• 20421720 squared (20421720²) is 417046647758400
• 20421720 cubed (20421720³) is 8516809867460672448000
• The square root of 20421720 is 4519.0397210025
• The cube root of 20421720 is 273.3363804273

Scales and comparisons

• 20,421,720 seconds is equal to 33 weeks, 5 days, 8 hours, 42 minutes.
• To count from 1 to 20,421,720 would take you about fifty 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 20421720 cubic inches would be around 22.8 feet tall.

Recreational maths with 20421720

• 20421720 backwards is 02712402
• 20421720 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 20421720's digits is 18
• More coming soon!