20909870

素因数分解:

$2^1\times 5^1\times {\mathrm{29}}^1\times {\mathrm{72103}}^1$

素因数の和:72139

約数の個数: 16

約数和(自身を含む): 38936160

約数和(自身を除く): 18026290

約数列:

[1, 2, 5, 10, 29, 58, 145, 290, 72103, 144206, 360515, 721030, 2090987, 4181974, 10454935, 20909870]

約数ペア:

[(1, 20909870), (2, 10454935), (5, 4181974), (10, 2090987), (29, 721030), (58, 360515), (145, 144206), (290, 72103)]