28720521

素因数分解:

$3^3\times {\mathrm{257}}^1\times {\mathrm{4139}}^1$

素因数の和:4405

約数の個数: 16

約数和(自身を含む): 42724800

約数和(自身を除く): 14004279

約数列:

[1, 3, 9, 27, 257, 771, 2313, 4139, 6939, 12417, 37251, 111753, 1063723, 3191169, 9573507, 28720521]

約数ペア:

[(1, 28720521), (3, 9573507), (9, 3191169), (27, 1063723), (257, 111753), (771, 37251), (2313, 12417), (4139, 6939)]