21809090

素因数分解:

$2^1\times 5^1\times {\mathrm{1091}}^1\times {\mathrm{1999}}^1$

素因数の和:3097

約数の個数: 16

約数和(自身を含む): 39312000

約数和(自身を除く): 17502910

約数列:

[1, 2, 5, 10, 1091, 1999, 2182, 3998, 5455, 9995, 10910, 19990, 2180909, 4361818, 10904545, 21809090]

約数ペア:

[(1, 21809090), (2, 10904545), (5, 4361818), (10, 2180909), (1091, 19990), (1999, 10910), (2182, 9995), (3998, 5455)]