21120725

素因数分解:

$5^2\times {\mathrm{71}}^1\times {\mathrm{73}}^1\times {\mathrm{163}}^1$

素因数の和:317

約数の個数: 24

約数和(自身を含む): 27087552

約数和(自身を除く): 5966827

約数列:

[1, 5, 25, 71, 73, 163, 355, 365, 815, 1775, 1825, 4075, 5183, 11573, 11899, 25915, 57865, 59495, 129575, 289325, 297475, 844829, 4224145, 21120725]

約数ペア:

[(1, 21120725), (5, 4224145), (25, 844829), (71, 297475), (73, 289325), (163, 129575), (355, 59495), (365, 57865), (815, 25915), (1775, 11899), (1825, 11573), (4075, 5183)]