81871775

素因数分解:

$5^2\times {\mathrm{31}}^1\times {\mathrm{149}}^1\times {\mathrm{709}}^1$

素因数の和:899

約数の個数: 24

約数和(自身を含む): 105648000

約数和(自身を除く): 23776225

約数列:

[1, 5, 25, 31, 149, 155, 709, 745, 775, 3545, 3725, 4619, 17725, 21979, 23095, 105641, 109895, 115475, 528205, 549475, 2641025, 3274871, 16374355, 81871775]

約数ペア:

[(1, 81871775), (5, 16374355), (25, 3274871), (31, 2641025), (149, 549475), (155, 528205), (709, 115475), (745, 109895), (775, 105641), (3545, 23095), (3725, 21979), (4619, 17725)]