20399985

素因数分解:

$3^3\times 5^1\times {\mathrm{137}}^1\times {\mathrm{1103}}^1$

素因数の和:1254

約数の個数: 32

約数和(自身を含む): 36564480

約数和(自身を除く): 16164495

約数列:

[1, 3, 5, 9, 15, 27, 45, 135, 137, 411, 685, 1103, 1233, 2055, 3309, 3699, 5515, 6165, 9927, 16545, 18495, 29781, 49635, 148905, 151111, 453333, 755555, 1359999, 2266665, 4079997, 6799995, 20399985]

約数ペア:

[(1, 20399985), (3, 6799995), (5, 4079997), (9, 2266665), (15, 1359999), (27, 755555), (45, 453333), (135, 151111), (137, 148905), (411, 49635), (685, 29781), (1103, 18495), (1233, 16545), (2055, 9927), (3309, 6165), (3699, 5515)]