21006720

Names of 21006720

• Cardinal: 21006720 can be written as Twenty-one million, six thousand, seven hundred twenty.

Scientific notation

• Scientific notation: 2.100672 × 10⁷

Factors of 21006720

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 12
• Sum of prime factors: 538

Divisors of 21006720

• Number of divisors d(n): 192
• Complete list of divisors:
  1 2 3 4 5 6 7 8 9 10 12 14 15 16 18 20 21 24 28 30 32 35 36 40 42 45 48 56 60 63 64 70 72 80 84 90 96 105 112 120 126 128 140 144 160 168 180 192 210 224 240 252 280 288 315 320 336 360 384 420 448 480 504 521 560 576 630 640 672 720 840 896 960 1008 1042 1120 1152 1260 1344 1440 1563 1680 1920 2016 2084 2240 2520 2605 2688 2880 3126 3360 3647 4032 4168 4480 4689 5040 5210 5760 6252 6720 7294 7815 8064 8336 9378 10080 10420 10941 12504 13440 14588 15630 16672 18235 18756 20160 20840 21882 23445 25008 29176 31260 32823 33344 36470 37512 40320 41680 43764 46890 50016 54705 58352 62520 65646 66688 72940 75024 83360 87528 93780 100032 109410 116704 125040 131292 145880 150048 164115 166720 175056 187560 200064 218820 233408 250080 262584 291760 300096 328230 333440 350112 375120 437640 466816 500160 525168 583520 600192 656460 700224 750240 875280 1000320 1050336 1167040 1312920 1400448 1500480 1750560 2100672 2334080 2625840 3000960 3501120 4201344 5251680 7002240 10503360 21006720
• Sum of all divisors σ(n): 83060640
• Sum of proper divisors (its aliquot sum) s(n): 62053920
• 21006720 is an abundant number, because the sum of its proper divisors (62053920) is greater than itself. Its abundance is 41047200

Bases of 21006720

• Binary: 1010000001000100110000000₂
• Hexadecimal: 0x1408980
• Base-36: CI8W0

Squares and roots of 21006720

• 21006720 squared (21006720²) is 441282285158400
• 21006720 cubed (21006720³) is 9269893405282664448000
• The square root of 21006720 is 4583.3088484195
• The cube root of 21006720 is 275.9218430241

Scales and comparisons

• 21,006,720 seconds is equal to 34 weeks, 5 days, 3 hours, 12 minutes.
• To count from 1 to 21,006,720 would take you about sixteen 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 21006720 cubic inches would be around 23 feet tall.

Recreational maths with 21006720

• 21006720 backwards is 02760012
• 21006720 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 21006720's digits is 18
• More coming soon!