19909090

素因数分解:

$2^1\times 5^1\times {\mathrm{421}}^1\times {\mathrm{4729}}^1$

素因数の和:5157

約数の個数: 16

約数和(自身を含む): 35929080

約数和(自身を除く): 16019990

約数列:

[1, 2, 5, 10, 421, 842, 2105, 4210, 4729, 9458, 23645, 47290, 1990909, 3981818, 9954545, 19909090]

約数ペア:

[(1, 19909090), (2, 9954545), (5, 3981818), (10, 1990909), (421, 47290), (842, 23645), (2105, 9458), (4210, 4729)]