12800180

素因数分解:

$2^2\times 5^1\times {\mathrm{640009}}^1$

素因数の和:640018

約数の個数: 12

約数和(自身を含む): 26880420

約数和(自身を除く): 14080240

約数列:

[1, 2, 4, 5, 10, 20, 640009, 1280018, 2560036, 3200045, 6400090, 12800180]

約数ペア:

[(1, 12800180), (2, 6400090), (4, 3200045), (5, 2560036), (10, 1280018), (20, 640009)]