18418420

素因数分解:

$2^2\times 5^1\times {\mathrm{920921}}^1$

素因数の和:920930

約数の個数: 12

約数和(自身を含む): 38678724

約数和(自身を除く): 20260304

約数列:

[1, 2, 4, 5, 10, 20, 920921, 1841842, 3683684, 4604605, 9209210, 18418420]

約数ペア:

[(1, 18418420), (2, 9209210), (4, 4604605), (5, 3683684), (10, 1841842), (20, 920921)]