20490980

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{24989}}^1$

素因数の和:25039

約数の個数: 24

約数和(自身を含む): 44082360

約数和(自身を除く): 23591380

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 24989, 49978, 99956, 124945, 249890, 499780, 1024549, 2049098, 4098196, 5122745, 10245490, 20490980]

約数ペア:

[(1, 20490980), (2, 10245490), (4, 5122745), (5, 4098196), (10, 2049098), (20, 1024549), (41, 499780), (82, 249890), (164, 124945), (205, 99956), (410, 49978), (820, 24989)]