21653780

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{17749}}^1$

素因数の和:17819

約数の個数: 24

約数和(自身を含む): 46221000

約数和(自身を除く): 24567220

約数列:

[1, 2, 4, 5, 10, 20, 61, 122, 244, 305, 610, 1220, 17749, 35498, 70996, 88745, 177490, 354980, 1082689, 2165378, 4330756, 5413445, 10826890, 21653780]

約数ペア:

[(1, 21653780), (2, 10826890), (4, 5413445), (5, 4330756), (10, 2165378), (20, 1082689), (61, 354980), (122, 177490), (244, 88745), (305, 70996), (610, 35498), (1220, 17749)]