21753820

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{61}}^1\times {\mathrm{1621}}^1$

素因数の和:1702

約数の個数: 48

約数和(自身を含む): 50684256

約数和(自身を除く): 28930436

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 61, 110, 122, 220, 244, 305, 610, 671, 1220, 1342, 1621, 2684, 3242, 3355, 6484, 6710, 8105, 13420, 16210, 17831, 32420, 35662, 71324, 89155, 98881, 178310, 197762, 356620, 395524, 494405, 988810, 1087691, 1977620, 2175382, 4350764, 5438455, 10876910, 21753820]

約数ペア:

[(1, 21753820), (2, 10876910), (4, 5438455), (5, 4350764), (10, 2175382), (11, 1977620), (20, 1087691), (22, 988810), (44, 494405), (55, 395524), (61, 356620), (110, 197762), (122, 178310), (220, 98881), (244, 89155), (305, 71324), (610, 35662), (671, 32420), (1220, 17831), (1342, 16210), (1621, 13420), (2684, 8105), (3242, 6710), (3355, 6484)]