20809551

素因数分解:

$3^1\times 7^1\times {\mathrm{139}}^1\times {\mathrm{7129}}^1$

素因数の和:7278

約数の個数: 16

約数和(自身を含む): 31942400

約数和(自身を除く): 11132849

約数列:

[1, 3, 7, 21, 139, 417, 973, 2919, 7129, 21387, 49903, 149709, 990931, 2972793, 6936517, 20809551]

約数ペア:

[(1, 20809551), (3, 6936517), (7, 2972793), (21, 990931), (139, 149709), (417, 49903), (973, 21387), (2919, 7129)]