21387520
21,387,520 is an even composite number composed of five prime numbers multiplied together.
21387520 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of two hundred sixteen divisors.
Prime factorization of 21387520:
28 × 5 × 72 × 11 × 31
(2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 5 × 7 × 7 × 11 × 31)See below for interesting mathematical facts about the number 21387520 from the Numbermatics database.
Names of 21387520
- Cardinal: 21387520 can be written as Twenty-one million, three hundred eighty-seven thousand, five hundred twenty.
Scientific notation
- Scientific notation: 2.138752 × 107
Factors of 21387520
Divisors of 21387520
- Number of divisors d(n): 216
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Complete list of divisors:
1 2 4 5 7 8 10 11 14 16 20 22 28 31 32 35 40 44 49 55 56 62 64 70 77 80 88 98 110 112 124 128 140 154 155 160 176 196 217 220 224 245 248 256 280 308 310 320 341 352 385 392 434 440 448 490 496 539 560 616 620 640 682 704 770 784 868 880 896 980 992 1078 1085 1120 1232 1240 1280 1364 1408 1519 1540 1568 1705 1736 1760 1792 1960 1984 2156 2170 2240 2387 2464 2480 2695 2728 2816 3038 3080 3136 3410 3472 3520 3920 3968 4312 4340 4480 4774 4928 4960 5390 5456 6076 6160 6272 6820 6944 7040 7595 7840 7936 8624 8680 8960 9548 9856 9920 10780 10912 11935 12152 12320 12544 13640 13888 14080 15190 15680 16709 17248 17360 19096 19712 19840 21560 21824 23870 24304 24640 27280 27776 30380 31360 33418 34496 34720 38192 39680 43120 43648 47740 48608 49280 54560 55552 60760 62720 66836 68992 69440 76384 83545 86240 87296 95480 97216 98560 109120 121520 133672 137984 138880 152768 167090 172480 190960 194432 218240 243040 267344 277760 305536 334180 344960 381920 388864 436480 486080 534688 611072 668360 689920 763840 972160 1069376 1336720 1527680 1944320 2138752 2673440 3055360 4277504 5346880 10693760 21387520
- Sum of all divisors σ(n): 67108608
- Sum of proper divisors (its aliquot sum) s(n): 45721088
- 21387520 is an abundant number, because the sum of its proper divisors (45721088) is greater than itself. Its abundance is 24333568
Bases of 21387520
- Binary: 10100011001011001000000002
- Hexadecimal: 0x1465900
- Base-36: CQEPS
Squares and roots of 21387520
- 21387520 squared (213875202) is 457426011750400
- 21387520 cubed (213875203) is 9783207974831915008000
-
The
square root of 21387520 is 4624.6643121421 -
The
cube root of 21387520 is 277.5791295591
Scales and comparisons
How big is 21387520?- 21,387,520 seconds is equal to 35 weeks, 2 days, 12 hours, 58 minutes, 40 seconds.
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To count from 1 to 21,387,520 would take you about seven 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 21387520 cubic inches would be around 23.1 feet tall.
Recreational maths with 21387520
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The information we have on file for 21387520 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!
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