20648980

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{47}}^1\times {\mathrm{1997}}^1$

素因数の和:2064

約数の個数: 48

約数和(自身を含む): 48335616

約数和(自身を除く): 27686636

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 47, 55, 94, 110, 188, 220, 235, 470, 517, 940, 1034, 1997, 2068, 2585, 3994, 5170, 7988, 9985, 10340, 19970, 21967, 39940, 43934, 87868, 93859, 109835, 187718, 219670, 375436, 439340, 469295, 938590, 1032449, 1877180, 2064898, 4129796, 5162245, 10324490, 20648980]

約数ペア:

[(1, 20648980), (2, 10324490), (4, 5162245), (5, 4129796), (10, 2064898), (11, 1877180), (20, 1032449), (22, 938590), (44, 469295), (47, 439340), (55, 375436), (94, 219670), (110, 187718), (188, 109835), (220, 93859), (235, 87868), (470, 43934), (517, 39940), (940, 21967), (1034, 19970), (1997, 10340), (2068, 9985), (2585, 7988), (3994, 5170)]