20778885

素因数分解:

$3^2\times 5^1\times {\mathrm{557}}^1\times {\mathrm{829}}^1$

素因数の和:1397

約数の個数: 24

約数和(自身を含む): 36124920

約数和(自身を除く): 15346035

約数列:

[1, 3, 5, 9, 15, 45, 557, 829, 1671, 2487, 2785, 4145, 5013, 7461, 8355, 12435, 25065, 37305, 461753, 1385259, 2308765, 4155777, 6926295, 20778885]

約数ペア:

[(1, 20778885), (3, 6926295), (5, 4155777), (9, 2308765), (15, 1385259), (45, 461753), (557, 37305), (829, 25065), (1671, 12435), (2487, 8355), (2785, 7461), (4145, 5013)]