20079280

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{449}}^1$

素因数の和:518

約数の個数: 80

約数和(自身を含む): 51559200

約数和(自身を除く): 31479920

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 43, 52, 65, 80, 86, 104, 130, 172, 208, 215, 260, 344, 430, 449, 520, 559, 688, 860, 898, 1040, 1118, 1720, 1796, 2236, 2245, 2795, 3440, 3592, 4472, 4490, 5590, 5837, 7184, 8944, 8980, 11180, 11674, 17960, 19307, 22360, 23348, 29185, 35920, 38614, 44720, 46696, 58370, 77228, 93392, 96535, 116740, 154456, 193070, 233480, 250991, 308912, 386140, 466960, 501982, 772280, 1003964, 1254955, 1544560, 2007928, 2509910, 4015856, 5019820, 10039640, 20079280]

約数ペア:

[(1, 20079280), (2, 10039640), (4, 5019820), (5, 4015856), (8, 2509910), (10, 2007928), (13, 1544560), (16, 1254955), (20, 1003964), (26, 772280), (40, 501982), (43, 466960), (52, 386140), (65, 308912), (80, 250991), (86, 233480), (104, 193070), (130, 154456), (172, 116740), (208, 96535), (215, 93392), (260, 77228), (344, 58370), (430, 46696), (449, 44720), (520, 38614), (559, 35920), (688, 29185), (860, 23348), (898, 22360), (1040, 19307), (1118, 17960), (1720, 11674), (1796, 11180), (2236, 8980), (2245, 8944), (2795, 7184), (3440, 5837), (3592, 5590), (4472, 4490)]