18811989

素因数分解:

$3^2\times 7^1\times {\mathrm{41}}^1\times {\mathrm{7283}}^1$

素因数の和:7337

約数の個数: 24

約数和(自身を含む): 31816512

約数和(自身を除く): 13004523

約数列:

[1, 3, 7, 9, 21, 41, 63, 123, 287, 369, 861, 2583, 7283, 21849, 50981, 65547, 152943, 298603, 458829, 895809, 2090221, 2687427, 6270663, 18811989]

約数ペア:

[(1, 18811989), (3, 6270663), (7, 2687427), (9, 2090221), (21, 895809), (41, 458829), (63, 298603), (123, 152943), (287, 65547), (369, 50981), (861, 21849), (2583, 7283)]