290400020

素因数分解:

$2^2\times 5^1\times {\mathrm{181}}^1\times {\mathrm{80221}}^1$

素因数の和:80411

約数の個数: 24

約数和(自身を含む): 613216968

約数和(自身を除く): 322816948

約数列:

[1, 2, 4, 5, 10, 20, 181, 362, 724, 905, 1810, 3620, 80221, 160442, 320884, 401105, 802210, 1604420, 14520001, 29040002, 58080004, 72600005, 145200010, 290400020]

約数ペア:

[(1, 290400020), (2, 145200010), (4, 72600005), (5, 58080004), (10, 29040002), (20, 14520001), (181, 1604420), (362, 802210), (724, 401105), (905, 320884), (1810, 160442), (3620, 80221)]