21125555

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{191}}^1\times {\mathrm{2011}}^1$

素因数の和:2218

約数の個数: 16

約数和(自身を含む): 27813888

約数和(自身を除く): 6688333

約数列:

[1, 5, 11, 55, 191, 955, 2011, 2101, 10055, 10505, 22121, 110605, 384101, 1920505, 4225111, 21125555]

約数ペア:

[(1, 21125555), (5, 4225111), (11, 1920505), (55, 384101), (191, 110605), (955, 22121), (2011, 10505), (2101, 10055)]