21009911

素因数分解:

${\mathrm{13}}^3\times {\mathrm{73}}^1\times {\mathrm{131}}^1$

素因数の和:243

約数の個数: 16

約数和(自身を含む): 23247840

約数和(自身を除く): 2237929

約数列:

[1, 13, 73, 131, 169, 949, 1703, 2197, 9563, 12337, 22139, 124319, 160381, 287807, 1616147, 21009911]

約数ペア:

[(1, 21009911), (13, 1616147), (73, 287807), (131, 160381), (169, 124319), (949, 22139), (1703, 12337), (2197, 9563)]