20157980

素因数分解:

$2^2\times 5^1\times {\mathrm{389}}^1\times {\mathrm{2591}}^1$

素因数の和:2989

約数の個数: 24

約数和(自身を含む): 42456960

約数和(自身を除く): 22298980

約数列:

[1, 2, 4, 5, 10, 20, 389, 778, 1556, 1945, 2591, 3890, 5182, 7780, 10364, 12955, 25910, 51820, 1007899, 2015798, 4031596, 5039495, 10078990, 20157980]

約数ペア:

[(1, 20157980), (2, 10078990), (4, 5039495), (5, 4031596), (10, 2015798), (20, 1007899), (389, 51820), (778, 25910), (1556, 12955), (1945, 10364), (2591, 7780), (3890, 5182)]