21557140

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{97987}}^1$

素因数の和:98007

約数の個数: 24

約数和(自身を含む): 49385952

約数和(自身を除く): 27828812

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220, 97987, 195974, 391948, 489935, 979870, 1077857, 1959740, 2155714, 4311428, 5389285, 10778570, 21557140]

約数ペア:

[(1, 21557140), (2, 10778570), (4, 5389285), (5, 4311428), (10, 2155714), (11, 1959740), (20, 1077857), (22, 979870), (44, 489935), (55, 391948), (110, 195974), (220, 97987)]