20405918

素因数分解:

$2^1\times {\mathrm{13}}^1\times {\mathrm{157}}^1\times {\mathrm{4999}}^1$

素因数の和:5171

約数の個数: 16

約数和(自身を含む): 33180000

約数和(自身を除く): 12774082

約数列:

[1, 2, 13, 26, 157, 314, 2041, 4082, 4999, 9998, 64987, 129974, 784843, 1569686, 10202959, 20405918]

約数ペア:

[(1, 20405918), (2, 10202959), (13, 1569686), (26, 784843), (157, 129974), (314, 64987), (2041, 9998), (4082, 4999)]