642555

素因数分解:

$3^2\times 5^1\times {\mathrm{109}}^1\times {\mathrm{131}}^1$

素因数の和:251

約数の個数: 24

約数和(自身を含む): 1132560

約数和(自身を除く): 490005

約数列:

[1, 3, 5, 9, 15, 45, 109, 131, 327, 393, 545, 655, 981, 1179, 1635, 1965, 4905, 5895, 14279, 42837, 71395, 128511, 214185, 642555]

約数ペア:

[(1, 642555), (3, 214185), (5, 128511), (9, 71395), (15, 42837), (45, 14279), (109, 5895), (131, 4905), (327, 1965), (393, 1635), (545, 1179), (655, 981)]