20081980

素因数分解:

$2^2\times 5^1\times {\mathrm{257}}^1\times {\mathrm{3907}}^1$

素因数の和:4173

約数の個数: 24

約数和(自身を含む): 42347088

約数和(自身を除く): 22265108

約数列:

[1, 2, 4, 5, 10, 20, 257, 514, 1028, 1285, 2570, 3907, 5140, 7814, 15628, 19535, 39070, 78140, 1004099, 2008198, 4016396, 5020495, 10040990, 20081980]

約数ペア:

[(1, 20081980), (2, 10040990), (4, 5020495), (5, 4016396), (10, 2008198), (20, 1004099), (257, 78140), (514, 39070), (1028, 19535), (1285, 15628), (2570, 7814), (3907, 5140)]