639657

素因数分解:

$3^4\times {\mathrm{53}}^1\times {\mathrm{149}}^1$

素因数の和:214

約数の個数: 20

約数和(自身を含む): 980100

約数和(自身を除く): 340443

約数列:

[1, 3, 9, 27, 53, 81, 149, 159, 447, 477, 1341, 1431, 4023, 4293, 7897, 12069, 23691, 71073, 213219, 639657]

約数ペア:

[(1, 639657), (3, 213219), (9, 71073), (27, 23691), (53, 12069), (81, 7897), (149, 4293), (159, 4023), (447, 1431), (477, 1341)]