20817775

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{61}}^1\times {\mathrm{73}}^1$

素因数の和:172

約数の個数: 48

約数和(自身を含む): 30721248

約数和(自身を除く): 9903473

約数列:

[1, 5, 11, 17, 25, 55, 61, 73, 85, 187, 275, 305, 365, 425, 671, 803, 935, 1037, 1241, 1525, 1825, 3355, 4015, 4453, 4675, 5185, 6205, 11407, 13651, 16775, 20075, 22265, 25925, 31025, 48983, 57035, 68255, 75701, 111325, 244915, 285175, 341275, 378505, 832711, 1224575, 1892525, 4163555, 20817775]

約数ペア:

[(1, 20817775), (5, 4163555), (11, 1892525), (17, 1224575), (25, 832711), (55, 378505), (61, 341275), (73, 285175), (85, 244915), (187, 111325), (275, 75701), (305, 68255), (365, 57035), (425, 48983), (671, 31025), (803, 25925), (935, 22265), (1037, 20075), (1241, 16775), (1525, 13651), (1825, 11407), (3355, 6205), (4015, 5185), (4453, 4675)]