21355821

素因数分解:

$3^2\times {\mathrm{43}}^1\times {\mathrm{139}}^1\times {\mathrm{397}}^1$

素因数の和:585

約数の個数: 24

約数和(自身を含む): 31871840

約数和(自身を除く): 10516019

約数列:

[1, 3, 9, 43, 129, 139, 387, 397, 417, 1191, 1251, 3573, 5977, 17071, 17931, 51213, 53793, 55183, 153639, 165549, 496647, 2372869, 7118607, 21355821]

約数ペア:

[(1, 21355821), (3, 7118607), (9, 2372869), (43, 496647), (129, 165549), (139, 153639), (387, 55183), (397, 53793), (417, 51213), (1191, 17931), (1251, 17071), (3573, 5977)]