20904723

素因数分解:

$3^4\times 7^2\times {\mathrm{23}}^1\times {\mathrm{229}}^1$

素因数の和:278

約数の個数: 60

約数和(自身を含む): 38071440

約数和(自身を除く): 17166717

約数列:

[1, 3, 7, 9, 21, 23, 27, 49, 63, 69, 81, 147, 161, 189, 207, 229, 441, 483, 567, 621, 687, 1127, 1323, 1449, 1603, 1863, 2061, 3381, 3969, 4347, 4809, 5267, 6183, 10143, 11221, 13041, 14427, 15801, 18549, 30429, 33663, 36869, 43281, 47403, 91287, 100989, 110607, 129843, 142209, 258083, 302967, 331821, 426627, 774249, 908901, 995463, 2322747, 2986389, 6968241, 20904723]

約数ペア:

[(1, 20904723), (3, 6968241), (7, 2986389), (9, 2322747), (21, 995463), (23, 908901), (27, 774249), (49, 426627), (63, 331821), (69, 302967), (81, 258083), (147, 142209), (161, 129843), (189, 110607), (207, 100989), (229, 91287), (441, 47403), (483, 43281), (567, 36869), (621, 33663), (687, 30429), (1127, 18549), (1323, 15801), (1449, 14427), (1603, 13041), (1863, 11221), (2061, 10143), (3381, 6183), (3969, 5267), (4347, 4809)]