19988978

素因数分解:

$2^1\times {\mathrm{23}}^1\times {\mathrm{353}}^1\times {\mathrm{1231}}^1$

素因数の和:1609

約数の個数: 16

約数和(自身を含む): 31401216

約数和(自身を除く): 11412238

約数列:

[1, 2, 23, 46, 353, 706, 1231, 2462, 8119, 16238, 28313, 56626, 434543, 869086, 9994489, 19988978]

約数ペア:

[(1, 19988978), (2, 9994489), (23, 869086), (46, 434543), (353, 56626), (706, 28313), (1231, 16238), (2462, 8119)]