20499820

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^2\times {\mathrm{43}}^1\times {\mathrm{197}}^1$

素因数の和:271

約数の個数: 72

約数和(自身を含む): 48665232

約数和(自身を除く): 28165412

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 43, 44, 55, 86, 110, 121, 172, 197, 215, 220, 242, 394, 430, 473, 484, 605, 788, 860, 946, 985, 1210, 1892, 1970, 2167, 2365, 2420, 3940, 4334, 4730, 5203, 8471, 8668, 9460, 10406, 10835, 16942, 20812, 21670, 23837, 26015, 33884, 42355, 43340, 47674, 52030, 84710, 93181, 95348, 104060, 119185, 169420, 186362, 238370, 372724, 465905, 476740, 931810, 1024991, 1863620, 2049982, 4099964, 5124955, 10249910, 20499820]

約数ペア:

[(1, 20499820), (2, 10249910), (4, 5124955), (5, 4099964), (10, 2049982), (11, 1863620), (20, 1024991), (22, 931810), (43, 476740), (44, 465905), (55, 372724), (86, 238370), (110, 186362), (121, 169420), (172, 119185), (197, 104060), (215, 95348), (220, 93181), (242, 84710), (394, 52030), (430, 47674), (473, 43340), (484, 42355), (605, 33884), (788, 26015), (860, 23837), (946, 21670), (985, 20812), (1210, 16942), (1892, 10835), (1970, 10406), (2167, 9460), (2365, 8668), (2420, 8471), (3940, 5203), (4334, 4730)]