20705979

素因数分解:

$3^1\times 7^2\times {\mathrm{79}}^1\times {\mathrm{1783}}^1$

素因数の和:1879

約数の個数: 24

約数和(自身を含む): 32540160

約数和(自身を除く): 11834181

約数列:

[1, 3, 7, 21, 49, 79, 147, 237, 553, 1659, 1783, 3871, 5349, 11613, 12481, 37443, 87367, 140857, 262101, 422571, 985999, 2957997, 6901993, 20705979]

約数ペア:

[(1, 20705979), (3, 6901993), (7, 2957997), (21, 985999), (49, 422571), (79, 262101), (147, 140857), (237, 87367), (553, 37443), (1659, 12481), (1783, 11613), (3871, 5349)]