21540420

Names of 21540420

• Cardinal: 21540420 can be written as Twenty-one million, five hundred forty thousand, four hundred twenty.

Scientific notation

• Scientific notation: 2.154042 × 10⁷

Factors of 21540420

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 87

Divisors of 21540420

• Number of divisors d(n): 216
• Complete list of divisors:
  1 2 3 4 5 6 9 10 11 12 15 18 20 22 23 30 33 36 43 44 45 46 55 60 66 69 86 90 92 99 110 115 121 129 132 138 165 172 180 198 207 215 220 230 242 253 258 276 330 345 363 387 396 414 430 460 473 484 495 506 516 605 645 660 690 726 759 774 828 860 946 989 990 1012 1035 1089 1210 1265 1290 1380 1419 1452 1518 1548 1815 1892 1935 1978 1980 2070 2178 2277 2365 2420 2530 2580 2783 2838 2967 3036 3630 3795 3870 3956 4140 4257 4356 4554 4730 4945 5060 5203 5445 5566 5676 5934 7095 7260 7590 7740 8349 8514 8901 9108 9460 9890 10406 10879 10890 11132 11385 11868 13915 14190 14835 15180 15609 16698 17028 17802 19780 20812 21285 21758 21780 22770 25047 26015 27830 28380 29670 31218 32637 33396 35604 41745 42570 43516 44505 45540 46827 50094 52030 54395 55660 59340 62436 65274 78045 83490 85140 89010 93654 97911 100188 104060 108790 119669 125235 130548 156090 163185 166980 178020 187308 195822 217580 234135 239338 250470 312180 326370 359007 391644 468270 478676 489555 500940 598345 652740 718014 936540 979110 1077021 1196690 1436028 1795035 1958220 2154042 2393380 3590070 4308084 5385105 7180140 10770210 21540420
• Sum of all divisors σ(n): 76684608
• Sum of proper divisors (its aliquot sum) s(n): 55144188
• 21540420 is an abundant number, because the sum of its proper divisors (55144188) is greater than itself. Its abundance is 33603768

Bases of 21540420

• Binary: 1010010001010111001000100₂
• Hexadecimal: 0x148AE44
• Base-36: CTOP0

Squares and roots of 21540420

• 21540420 squared (21540420²) is 463989693776400
• 21540420 cubed (21540420³) is 9994532879615042088000
• The square root of 21540420 is 4641.1658018217
• The cube root of 21540420 is 278.2390332377

Scales and comparisons

• 21,540,420 seconds is equal to 35 weeks, 4 days, 7 hours, 27 minutes.
• To count from 1 to 21,540,420 would take you about two 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 21540420 cubic inches would be around 23.2 feet tall.

Recreational maths with 21540420

• 21540420 backwards is 02404512
• 21540420 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 21540420's digits is 18
• More coming soon!