640521

素因数分解:

$3^3\times 7^1\times {\mathrm{3389}}^1$

素因数の和:3405

約数の個数: 16

約数和(自身を含む): 1084800

約数和(自身を除く): 444279

約数列:

[1, 3, 7, 9, 21, 27, 63, 189, 3389, 10167, 23723, 30501, 71169, 91503, 213507, 640521]

約数ペア:

[(1, 640521), (3, 213507), (7, 91503), (9, 71169), (21, 30501), (27, 23723), (63, 10167), (189, 3389)]