21130780

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{139}}^1\times {\mathrm{691}}^1$

素因数の和:850

約数の個数: 48

約数和(自身を含む): 48827520

約数和(自身を除く): 27696740

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 139, 220, 278, 556, 691, 695, 1382, 1390, 1529, 2764, 2780, 3058, 3455, 6116, 6910, 7601, 7645, 13820, 15202, 15290, 30404, 30580, 38005, 76010, 96049, 152020, 192098, 384196, 480245, 960490, 1056539, 1920980, 2113078, 4226156, 5282695, 10565390, 21130780]

約数ペア:

[(1, 21130780), (2, 10565390), (4, 5282695), (5, 4226156), (10, 2113078), (11, 1920980), (20, 1056539), (22, 960490), (44, 480245), (55, 384196), (110, 192098), (139, 152020), (220, 96049), (278, 76010), (556, 38005), (691, 30580), (695, 30404), (1382, 15290), (1390, 15202), (1529, 13820), (2764, 7645), (2780, 7601), (3058, 6910), (3455, 6116)]