19998280

素因数分解:

$2^3\times 5^1\times {\mathrm{499957}}^1$

素因数の和:499968

約数の個数: 16

約数和(自身を含む): 44996220

約数和(自身を除く): 24997940

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 499957, 999914, 1999828, 2499785, 3999656, 4999570, 9999140, 19998280]

約数ペア:

[(1, 19998280), (2, 9999140), (4, 4999570), (5, 3999656), (8, 2499785), (10, 1999828), (20, 999914), (40, 499957)]