21308975

素因数分解:

$5^2\times {\mathrm{19}}^1\times {\mathrm{113}}^1\times {\mathrm{397}}^1$

素因数の和:539

約数の個数: 24

約数和(自身を含む): 28130640

約数和(自身を除く): 6821665

約数列:

[1, 5, 19, 25, 95, 113, 397, 475, 565, 1985, 2147, 2825, 7543, 9925, 10735, 37715, 44861, 53675, 188575, 224305, 852359, 1121525, 4261795, 21308975]

約数ペア:

[(1, 21308975), (5, 4261795), (19, 1121525), (25, 852359), (95, 224305), (113, 188575), (397, 53675), (475, 44861), (565, 37715), (1985, 10735), (2147, 9925), (2825, 7543)]