81818420

素因数分解:

$2^2\times 5^1\times {\mathrm{4090921}}^1$

素因数の和:4090930

約数の個数: 12

約数和(自身を含む): 171818724

約数和(自身を除く): 90000304

約数列:

[1, 2, 4, 5, 10, 20, 4090921, 8181842, 16363684, 20454605, 40909210, 81818420]

約数ペア:

[(1, 81818420), (2, 40909210), (4, 20454605), (5, 16363684), (10, 8181842), (20, 4090921)]