21081255

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{108109}}^1$

素因数の和:108130

約数の個数: 16

約数和(自身を含む): 36324960

約数和(自身を除く): 15243705

約数列:

[1, 3, 5, 13, 15, 39, 65, 195, 108109, 324327, 540545, 1405417, 1621635, 4216251, 7027085, 21081255]

約数ペア:

[(1, 21081255), (3, 7027085), (5, 4216251), (13, 1621635), (15, 1405417), (39, 540545), (65, 324327), (195, 108109)]