20105519

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{47}}^1\times {\mathrm{2657}}^1$

素因数の和:2734

約数の個数: 16

約数和(自身を含む): 24496128

約数和(自身を除く): 4390609

約数列:

[1, 7, 23, 47, 161, 329, 1081, 2657, 7567, 18599, 61111, 124879, 427777, 874153, 2872217, 20105519]

約数ペア:

[(1, 20105519), (7, 2872217), (23, 874153), (47, 427777), (161, 124879), (329, 61111), (1081, 18599), (2657, 7567)]