640485

素因数分解:

$3^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{331}}^1$

素因数の和:385

約数の個数: 24

約数和(自身を含む): 1139424

約数和(自身を除く): 498939

約数列:

[1, 3, 5, 9, 15, 43, 45, 129, 215, 331, 387, 645, 993, 1655, 1935, 2979, 4965, 14233, 14895, 42699, 71165, 128097, 213495, 640485]

約数ペア:

[(1, 640485), (3, 213495), (5, 128097), (9, 71165), (15, 42699), (43, 14895), (45, 14233), (129, 4965), (215, 2979), (331, 1935), (387, 1655), (645, 993)]