20800900

素因数分解:

$2^2\times 5^2\times {\mathrm{208009}}^1$

素因数の和:208023

約数の個数: 18

約数和(自身を含む): 45138170

約数和(自身を除く): 24337270

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 208009, 416018, 832036, 1040045, 2080090, 4160180, 5200225, 10400450, 20800900]

約数ペア:

[(1, 20800900), (2, 10400450), (4, 5200225), (5, 4160180), (10, 2080090), (20, 1040045), (25, 832036), (50, 416018), (100, 208009)]