19801818

素因数分解:

$2^1\times 3^2\times {\mathrm{1100101}}^1$

素因数の和:1100109

約数の個数: 12

約数和(自身を含む): 42903978

約数和(自身を除く): 23102160

約数列:

[1, 2, 3, 6, 9, 18, 1100101, 2200202, 3300303, 6600606, 9900909, 19801818]

約数ペア:

[(1, 19801818), (2, 9900909), (3, 6600606), (6, 3300303), (9, 2200202), (18, 1100101)]