19909780

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{90499}}^1$

素因数の和:90519

約数の個数: 24

約数和(自身を含む): 45612000

約数和(自身を除く): 25702220

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220, 90499, 180998, 361996, 452495, 904990, 995489, 1809980, 1990978, 3981956, 4977445, 9954890, 19909780]

約数ペア:

[(1, 19909780), (2, 9954890), (4, 4977445), (5, 3981956), (10, 1990978), (11, 1809980), (20, 995489), (22, 904990), (44, 452495), (55, 361996), (110, 180998), (220, 90499)]