640660

素因数分解:

$2^2\times 5^1\times {\mathrm{103}}^1\times {\mathrm{311}}^1$

素因数の和:423

約数の個数: 24

約数和(自身を含む): 1362816

約数和(自身を除く): 722156

約数列:

[1, 2, 4, 5, 10, 20, 103, 206, 311, 412, 515, 622, 1030, 1244, 1555, 2060, 3110, 6220, 32033, 64066, 128132, 160165, 320330, 640660]

約数ペア:

[(1, 640660), (2, 320330), (4, 160165), (5, 128132), (10, 64066), (20, 32033), (103, 6220), (206, 3110), (311, 2060), (412, 1555), (515, 1244), (622, 1030)]