19968991

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{31}}^1\times {\mathrm{4001}}^1$

素因数の和:4062

約数の個数: 16

約数和(自身を含む): 24588288

約数和(自身を除く): 4619297

約数列:

[1, 7, 23, 31, 161, 217, 713, 4001, 4991, 28007, 92023, 124031, 644161, 868217, 2852713, 19968991]

約数ペア:

[(1, 19968991), (7, 2852713), (23, 868217), (31, 644161), (161, 124031), (217, 92023), (713, 28007), (4001, 4991)]