21081980

素因数分解:

$2^2\times 5^1\times {\mathrm{97}}^1\times {\mathrm{10867}}^1$

素因数の和:10973

約数の個数: 24

約数和(自身を含む): 44732688

約数和(自身を除く): 23650708

約数列:

[1, 2, 4, 5, 10, 20, 97, 194, 388, 485, 970, 1940, 10867, 21734, 43468, 54335, 108670, 217340, 1054099, 2108198, 4216396, 5270495, 10540990, 21081980]

約数ペア:

[(1, 21081980), (2, 10540990), (4, 5270495), (5, 4216396), (10, 2108198), (20, 1054099), (97, 217340), (194, 108670), (388, 54335), (485, 43468), (970, 21734), (1940, 10867)]