20720975

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{151}}^1\times {\mathrm{499}}^1$

素因数の和:671

約数の個数: 24

約数和(自身を含む): 28272000

約数和(自身を除く): 7551025

約数列:

[1, 5, 11, 25, 55, 151, 275, 499, 755, 1661, 2495, 3775, 5489, 8305, 12475, 27445, 41525, 75349, 137225, 376745, 828839, 1883725, 4144195, 20720975]

約数ペア:

[(1, 20720975), (5, 4144195), (11, 1883725), (25, 828839), (55, 376745), (151, 137225), (275, 75349), (499, 41525), (755, 27445), (1661, 12475), (2495, 8305), (3775, 5489)]