19671981

素因数分解:

$3^1\times 7^2\times {\mathrm{163}}^1\times {\mathrm{821}}^1$

素因数の和:1001

約数の個数: 24

約数和(自身を含む): 30736224

約数和(自身を除く): 11064243

約数列:

[1, 3, 7, 21, 49, 147, 163, 489, 821, 1141, 2463, 3423, 5747, 7987, 17241, 23961, 40229, 120687, 133823, 401469, 936761, 2810283, 6557327, 19671981]

約数ペア:

[(1, 19671981), (3, 6557327), (7, 2810283), (21, 936761), (49, 401469), (147, 133823), (163, 120687), (489, 40229), (821, 23961), (1141, 17241), (2463, 7987), (3423, 5747)]