18918991

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{67}}^1\times {\mathrm{107}}^1$

素因数の和:223

約数の個数: 32

約数和(自身を含む): 24675840

約数和(自身を除く): 5756849

約数列:

[1, 7, 13, 29, 67, 91, 107, 203, 377, 469, 749, 871, 1391, 1943, 2639, 3103, 6097, 7169, 9737, 13601, 21721, 25259, 40339, 50183, 93197, 176813, 207901, 282373, 652379, 1455307, 2702713, 18918991]

約数ペア:

[(1, 18918991), (7, 2702713), (13, 1455307), (29, 652379), (67, 282373), (91, 207901), (107, 176813), (203, 93197), (377, 50183), (469, 40339), (749, 25259), (871, 21721), (1391, 13601), (1943, 9737), (2639, 7169), (3103, 6097)]