21217775

素因数分解:

$5^2\times {\mathrm{19}}^2\times {\mathrm{2351}}^1$

素因数の和:2399

約数の個数: 18

約数和(自身を含む): 27779472

約数和(自身を除く): 6561697

約数列:

[1, 5, 19, 25, 95, 361, 475, 1805, 2351, 9025, 11755, 44669, 58775, 223345, 848711, 1116725, 4243555, 21217775]

約数ペア:

[(1, 21217775), (5, 4243555), (19, 1116725), (25, 848711), (95, 223345), (361, 58775), (475, 44669), (1805, 11755), (2351, 9025)]