19986640

素因数分解:

$2^4\times 5^1\times {\mathrm{249833}}^1$

素因数の和:249846

約数の個数: 20

約数和(自身を含む): 46469124

約数和(自身を除く): 26482484

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 249833, 499666, 999332, 1249165, 1998664, 2498330, 3997328, 4996660, 9993320, 19986640]

約数ペア:

[(1, 19986640), (2, 9993320), (4, 4996660), (5, 3997328), (8, 2498330), (10, 1998664), (16, 1249165), (20, 999332), (40, 499666), (80, 249833)]