21257665

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^2\times {\mathrm{2287}}^1$

素因数の和:2329

約数の個数: 24

約数和(自身を含む): 30146688

約数和(自身を除く): 8889023

約数列:

[1, 5, 11, 13, 55, 65, 143, 169, 715, 845, 1859, 2287, 9295, 11435, 25157, 29731, 125785, 148655, 327041, 386503, 1635205, 1932515, 4251533, 21257665]

約数ペア:

[(1, 21257665), (5, 4251533), (11, 1932515), (13, 1635205), (55, 386503), (65, 327041), (143, 148655), (169, 125785), (715, 29731), (845, 25157), (1859, 11435), (2287, 9295)]