18820431

素因数分解:

$3^4\times 7^1\times {\mathrm{19}}^1\times {\mathrm{1747}}^1$

素因数の和:1785

約数の個数: 40

約数和(自身を含む): 33841280

約数和(自身を除く): 15020849

約数列:

[1, 3, 7, 9, 19, 21, 27, 57, 63, 81, 133, 171, 189, 399, 513, 567, 1197, 1539, 1747, 3591, 5241, 10773, 12229, 15723, 33193, 36687, 47169, 99579, 110061, 141507, 232351, 298737, 330183, 697053, 896211, 990549, 2091159, 2688633, 6273477, 18820431]

約数ペア:

[(1, 18820431), (3, 6273477), (7, 2688633), (9, 2091159), (19, 990549), (21, 896211), (27, 697053), (57, 330183), (63, 298737), (81, 232351), (133, 141507), (171, 110061), (189, 99579), (399, 47169), (513, 36687), (567, 33193), (1197, 15723), (1539, 12229), (1747, 10773), (3591, 5241)]