20420980

素因数分解:

$2^2\times 5^1\times {\mathrm{811}}^1\times {\mathrm{1259}}^1$

素因数の和:2079

約数の個数: 24

約数和(自身を含む): 42971040

約数和(自身を除く): 22550060

約数列:

[1, 2, 4, 5, 10, 20, 811, 1259, 1622, 2518, 3244, 4055, 5036, 6295, 8110, 12590, 16220, 25180, 1021049, 2042098, 4084196, 5105245, 10210490, 20420980]

約数ペア:

[(1, 20420980), (2, 10210490), (4, 5105245), (5, 4084196), (10, 2042098), (20, 1021049), (811, 25180), (1259, 16220), (1622, 12590), (2518, 8110), (3244, 6295), (4055, 5036)]