21991797

素因数分解:

$3^3\times {\mathrm{19}}^1\times {\mathrm{163}}^1\times {\mathrm{263}}^1$

素因数の和:454

約数の個数: 32

約数和(自身を含む): 34636800

約数和(自身を除く): 12645003

約数列:

[1, 3, 9, 19, 27, 57, 163, 171, 263, 489, 513, 789, 1467, 2367, 3097, 4401, 4997, 7101, 9291, 14991, 27873, 42869, 44973, 83619, 128607, 134919, 385821, 814511, 1157463, 2443533, 7330599, 21991797]

約数ペア:

[(1, 21991797), (3, 7330599), (9, 2443533), (19, 1157463), (27, 814511), (57, 385821), (163, 134919), (171, 128607), (263, 83619), (489, 44973), (513, 42869), (789, 27873), (1467, 14991), (2367, 9291), (3097, 7101), (4401, 4997)]