640403757

素因数分解:

$3^2\times 7^1\times {\mathrm{241}}^1\times {\mathrm{42179}}^1$

素因数の和:42433

約数の個数: 24

約数和(自身を含む): 1061586240

約数和(自身を除く): 421182483

約数列:

[1, 3, 7, 9, 21, 63, 241, 723, 1687, 2169, 5061, 15183, 42179, 126537, 295253, 379611, 885759, 2657277, 10165139, 30495417, 71155973, 91486251, 213467919, 640403757]

約数ペア:

[(1, 640403757), (3, 213467919), (7, 91486251), (9, 71155973), (21, 30495417), (63, 10165139), (241, 2657277), (723, 885759), (1687, 379611), (2169, 295253), (5061, 126537), (15183, 42179)]