12991881

素因数分解:

$3^1\times 7^1\times {\mathrm{47}}^1\times {\mathrm{13163}}^1$

素因数の和:13220

約数の個数: 16

約数和(自身を含む): 20219904

約数和(自身を除く): 7228023

約数列:

[1, 3, 7, 21, 47, 141, 329, 987, 13163, 39489, 92141, 276423, 618661, 1855983, 4330627, 12991881]

約数ペア:

[(1, 12991881), (3, 4330627), (7, 1855983), (21, 618661), (47, 276423), (141, 92141), (329, 39489), (987, 13163)]