21202020

Names of 21202020

• Cardinal: 21202020 can be written as Twenty-one million, two hundred two thousand and twenty.

Scientific notation

• Scientific notation: 2.120202 × 10⁷

Factors of 21202020

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 167

Divisors of 21202020

• Number of divisors d(n): 192
• Complete list of divisors:
  1 2 3 4 5 6 7 9 10 12 14 15 18 20 21 27 28 30 35 36 42 45 54 60 63 70 71 79 84 90 105 108 126 135 140 142 158 180 189 210 213 237 252 270 284 315 316 355 378 395 420 426 474 497 540 553 630 639 710 711 756 790 852 945 948 994 1065 1106 1185 1260 1278 1420 1422 1491 1580 1659 1890 1917 1988 2130 2133 2212 2370 2485 2556 2765 2844 2982 3195 3318 3555 3780 3834 4260 4266 4473 4740 4970 4977 5530 5609 5964 6390 6636 7110 7455 7668 8295 8532 8946 9585 9940 9954 10665 11060 11218 12780 13419 14220 14910 14931 16590 16827 17892 19170 19908 21330 22365 22436 24885 26838 28045 29820 29862 33180 33654 38340 39263 42660 44730 49770 50481 53676 56090 59724 67095 67308 74655 78526 84135 89460 99540 100962 112180 117789 134190 149310 151443 157052 168270 196315 201924 235578 252405 268380 298620 302886 336540 353367 392630 471156 504810 588945 605772 706734 757215 785260 1009620 1060101 1177890 1413468 1514430 1766835 2120202 2355780 3028860 3533670 4240404 5300505 7067340 10601010 21202020
• Sum of all divisors σ(n): 77414400
• Sum of proper divisors (its aliquot sum) s(n): 56212380
• 21202020 is an abundant number, because the sum of its proper divisors (56212380) is greater than itself. Its abundance is 35010360

Bases of 21202020

• Binary: 1010000111000010001100100₂
• Hexadecimal: 0x1438464
• Base-36: CMFL0

Squares and roots of 21202020

• 21202020 squared (21202020²) is 449525652080400
• 21202020 cubed (21202020³) is 9530851865921682408000
• The square root of 21202020 is 4604.5651260461
• The cube root of 21202020 is 276.7742908005

Scales and comparisons

• 21,202,020 seconds is equal to 35 weeks, 9 hours, 27 minutes.
• To count from 1 to 21,202,020 would take you about four days!

  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 21202020 cubic inches would be around 23.1 feet tall.

Recreational maths with 21202020

• 21202020 backwards is 02020212
• 21202020 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 21202020's digits is 9
• More coming soon!