20917953

素因数分解:

$3^3\times 7^2\times {\mathrm{97}}^1\times {\mathrm{163}}^1$

素因数の和:283

約数の個数: 48

約数和(自身を含む): 36644160

約数和(自身を除く): 15726207

約数列:

[1, 3, 7, 9, 21, 27, 49, 63, 97, 147, 163, 189, 291, 441, 489, 679, 873, 1141, 1323, 1467, 2037, 2619, 3423, 4401, 4753, 6111, 7987, 10269, 14259, 15811, 18333, 23961, 30807, 42777, 47433, 71883, 110677, 128331, 142299, 215649, 332031, 426897, 774739, 996093, 2324217, 2988279, 6972651, 20917953]

約数ペア:

[(1, 20917953), (3, 6972651), (7, 2988279), (9, 2324217), (21, 996093), (27, 774739), (49, 426897), (63, 332031), (97, 215649), (147, 142299), (163, 128331), (189, 110677), (291, 71883), (441, 47433), (489, 42777), (679, 30807), (873, 23961), (1141, 18333), (1323, 15811), (1467, 14259), (2037, 10269), (2619, 7987), (3423, 6111), (4401, 4753)]