81888020

素因数分解:

$2^2\times 5^1\times {\mathrm{181}}^1\times {\mathrm{22621}}^1$

素因数の和:22811

約数の個数: 24

約数和(自身を含む): 172922568

約数和(自身を除く): 91034548

約数列:

[1, 2, 4, 5, 10, 20, 181, 362, 724, 905, 1810, 3620, 22621, 45242, 90484, 113105, 226210, 452420, 4094401, 8188802, 16377604, 20472005, 40944010, 81888020]

約数ペア:

[(1, 81888020), (2, 40944010), (4, 20472005), (5, 16377604), (10, 8188802), (20, 4094401), (181, 452420), (362, 226210), (724, 113105), (905, 90484), (1810, 45242), (3620, 22621)]