3998980

素因数分解:

$2^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{2531}}^1$

素因数の和:2619

約数の個数: 24

約数和(自身を含む): 8507520

約数和(自身を除く): 4508540

約数列:

[1, 2, 4, 5, 10, 20, 79, 158, 316, 395, 790, 1580, 2531, 5062, 10124, 12655, 25310, 50620, 199949, 399898, 799796, 999745, 1999490, 3998980]

約数ペア:

[(1, 3998980), (2, 1999490), (4, 999745), (5, 799796), (10, 399898), (20, 199949), (79, 50620), (158, 25310), (316, 12655), (395, 10124), (790, 5062), (1580, 2531)]