20390811

素因数分解:

$3^1\times 7^2\times {\mathrm{23}}^1\times {\mathrm{37}}^1\times {\mathrm{163}}^1$

素因数の和:240

約数の個数: 48

約数和(自身を含む): 34101504

約数和(自身を除く): 13710693

約数列:

[1, 3, 7, 21, 23, 37, 49, 69, 111, 147, 161, 163, 259, 483, 489, 777, 851, 1127, 1141, 1813, 2553, 3381, 3423, 3749, 5439, 5957, 6031, 7987, 11247, 17871, 18093, 23961, 26243, 41699, 42217, 78729, 125097, 126651, 138713, 183701, 295519, 416139, 551103, 886557, 970991, 2912973, 6796937, 20390811]

約数ペア:

[(1, 20390811), (3, 6796937), (7, 2912973), (21, 970991), (23, 886557), (37, 551103), (49, 416139), (69, 295519), (111, 183701), (147, 138713), (161, 126651), (163, 125097), (259, 78729), (483, 42217), (489, 41699), (777, 26243), (851, 23961), (1127, 18093), (1141, 17871), (1813, 11247), (2553, 7987), (3381, 6031), (3423, 5957), (3749, 5439)]