19810900

素因数分解:

$2^2\times 5^2\times {\mathrm{198109}}^1$

素因数の和:198123

約数の個数: 18

約数和(自身を含む): 42989870

約数和(自身を除く): 23178970

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 198109, 396218, 792436, 990545, 1981090, 3962180, 4952725, 9905450, 19810900]

約数ペア:

[(1, 19810900), (2, 9905450), (4, 4952725), (5, 3962180), (10, 1981090), (20, 990545), (25, 792436), (50, 396218), (100, 198109)]