21400555

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{20479}}^1$

素因数の和:20514

約数の個数: 16

約数和(自身を含む): 29491200

約数和(自身を除く): 8090645

約数列:

[1, 5, 11, 19, 55, 95, 209, 1045, 20479, 102395, 225269, 389101, 1126345, 1945505, 4280111, 21400555]

約数ペア:

[(1, 21400555), (5, 4280111), (11, 1945505), (19, 1126345), (55, 389101), (95, 225269), (209, 102395), (1045, 20479)]