20990785

素因数分解:

$5^1\times {\mathrm{73}}^1\times {\mathrm{131}}^1\times {\mathrm{439}}^1$

素因数の和:648

約数の個数: 16

約数和(自身を含む): 25787520

約数和(自身を除く): 4796735

約数列:

[1, 5, 73, 131, 365, 439, 655, 2195, 9563, 32047, 47815, 57509, 160235, 287545, 4198157, 20990785]

約数ペア:

[(1, 20990785), (5, 4198157), (73, 287545), (131, 160235), (365, 57509), (439, 47815), (655, 32047), (2195, 9563)]