19978973

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{31}}^1\times {\mathrm{4003}}^1$

素因数の和:4064

約数の個数: 16

約数和(自身を含む): 24600576

約数和(自身を除く): 4621603

約数列:

[1, 7, 23, 31, 161, 217, 713, 4003, 4991, 28021, 92069, 124093, 644483, 868651, 2854139, 19978973]

約数ペア:

[(1, 19978973), (7, 2854139), (23, 868651), (31, 644483), (161, 124093), (217, 92069), (713, 28021), (4003, 4991)]