8040020

素因数分解:

$2^2\times 5^1\times {\mathrm{181}}^1\times {\mathrm{2221}}^1$

素因数の和:2411

約数の個数: 24

約数和(自身を含む): 16984968

約数和(自身を除く): 8944948

約数列:

[1, 2, 4, 5, 10, 20, 181, 362, 724, 905, 1810, 2221, 3620, 4442, 8884, 11105, 22210, 44420, 402001, 804002, 1608004, 2010005, 4020010, 8040020]

約数ペア:

[(1, 8040020), (2, 4020010), (4, 2010005), (5, 1608004), (10, 804002), (20, 402001), (181, 44420), (362, 22210), (724, 11105), (905, 8884), (1810, 4442), (2221, 3620)]