20987920

素因数分解:

$2^4\times 5^1\times {\mathrm{262349}}^1$

素因数の和:262362

約数の個数: 20

約数和(自身を含む): 48797100

約数和(自身を除く): 27809180

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 262349, 524698, 1049396, 1311745, 2098792, 2623490, 4197584, 5246980, 10493960, 20987920]

約数ペア:

[(1, 20987920), (2, 10493960), (4, 5246980), (5, 4197584), (8, 2623490), (10, 2098792), (16, 1311745), (20, 1049396), (40, 524698), (80, 262349)]