646840

素因数分解:

$2^3\times 5^1\times {\mathrm{103}}^1\times {\mathrm{157}}^1$

素因数の和:271

約数の個数: 32

約数和(自身を含む): 1478880

約数和(自身を除く): 832040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 103, 157, 206, 314, 412, 515, 628, 785, 824, 1030, 1256, 1570, 2060, 3140, 4120, 6280, 16171, 32342, 64684, 80855, 129368, 161710, 323420, 646840]

約数ペア:

[(1, 646840), (2, 323420), (4, 161710), (5, 129368), (8, 80855), (10, 64684), (20, 32342), (40, 16171), (103, 6280), (157, 4120), (206, 3140), (314, 2060), (412, 1570), (515, 1256), (628, 1030), (785, 824)]