199980080

素因数分解:

$2^4\times 5^1\times {\mathrm{2499751}}^1$

素因数の和:2499764

約数の個数: 20

約数和(自身を含む): 464953872

約数和(自身を除く): 264973792

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 2499751, 4999502, 9999004, 12498755, 19998008, 24997510, 39996016, 49995020, 99990040, 199980080]

約数ペア:

[(1, 199980080), (2, 99990040), (4, 49995020), (5, 39996016), (8, 24997510), (10, 19998008), (16, 12498755), (20, 9999004), (40, 4999502), (80, 2499751)]