19994900

素因数分解:

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

素因数の和:2624

約数の個数: 36

約数和(自身を含む): 43955520

約数和(自身を除く): 23960620

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 79, 100, 158, 316, 395, 790, 1580, 1975, 2531, 3950, 5062, 7900, 10124, 12655, 25310, 50620, 63275, 126550, 199949, 253100, 399898, 799796, 999745, 1999490, 3998980, 4998725, 9997450, 19994900]

約数ペア:

[(1, 19994900), (2, 9997450), (4, 4998725), (5, 3998980), (10, 1999490), (20, 999745), (25, 799796), (50, 399898), (79, 253100), (100, 199949), (158, 126550), (316, 63275), (395, 50620), (790, 25310), (1580, 12655), (1975, 10124), (2531, 7900), (3950, 5062)]