20981139

素因数分解:

$3^1\times {\mathrm{71}}^1\times {\mathrm{137}}^1\times {\mathrm{719}}^1$

素因数の和:930

約数の個数: 16

約数和(自身を含む): 28615680

約数和(自身を除く): 7634541

約数列:

[1, 3, 71, 137, 213, 411, 719, 2157, 9727, 29181, 51049, 98503, 153147, 295509, 6993713, 20981139]

約数ペア:

[(1, 20981139), (3, 6993713), (71, 295509), (137, 153147), (213, 98503), (411, 51049), (719, 29181), (2157, 9727)]