21275579

素因数分解:

${\mathrm{13}}^2\times {\mathrm{31}}^2\times {\mathrm{131}}^1$

素因数の和:219

約数の個数: 18

約数和(自身を含む): 23986908

約数和(自身を除く): 2711329

約数列:

[1, 13, 31, 131, 169, 403, 961, 1703, 4061, 5239, 12493, 22139, 52793, 125891, 162409, 686309, 1636583, 21275579]

約数ペア:

[(1, 21275579), (13, 1636583), (31, 686309), (131, 162409), (169, 125891), (403, 52793), (961, 22139), (1703, 12493), (4061, 5239)]