408020180

素因数分解:

$2^2\times 5^1\times {\mathrm{20401009}}^1$

素因数の和:20401018

約数の個数: 12

約数和(自身を含む): 856842420

約数和(自身を除く): 448822240

約数列:

[1, 2, 4, 5, 10, 20, 20401009, 40802018, 81604036, 102005045, 204010090, 408020180]

約数ペア:

[(1, 408020180), (2, 204010090), (4, 102005045), (5, 81604036), (10, 40802018), (20, 20401009)]