20640771

素因数分解:

$3^3\times {\mathrm{17}}^1\times {\mathrm{193}}^1\times {\mathrm{233}}^1$

素因数の和:452

約数の個数: 32

約数和(自身を含む): 32685120

約数和(自身を除く): 12044349

約数列:

[1, 3, 9, 17, 27, 51, 153, 193, 233, 459, 579, 699, 1737, 2097, 3281, 3961, 5211, 6291, 9843, 11883, 29529, 35649, 44969, 88587, 106947, 134907, 404721, 764473, 1214163, 2293419, 6880257, 20640771]

約数ペア:

[(1, 20640771), (3, 6880257), (9, 2293419), (17, 1214163), (27, 764473), (51, 404721), (153, 134907), (193, 106947), (233, 88587), (459, 44969), (579, 35649), (699, 29529), (1737, 11883), (2097, 9843), (3281, 6291), (3961, 5211)]