20997878

素因数分解:

$2^1\times {\mathrm{11}}^1\times {\mathrm{641}}^1\times {\mathrm{1489}}^1$

素因数の和:2143

約数の個数: 16

約数和(自身を含む): 34436880

約数和(自身を除く): 13439002

約数列:

[1, 2, 11, 22, 641, 1282, 1489, 2978, 7051, 14102, 16379, 32758, 954449, 1908898, 10498939, 20997878]

約数ペア:

[(1, 20997878), (2, 10498939), (11, 1908898), (22, 954449), (641, 32758), (1282, 16379), (1489, 14102), (2978, 7051)]