19991321

素因数分解:

$7^1\times {\mathrm{691}}^1\times {\mathrm{4133}}^1$

素因数の和:4831

約数の個数: 8

約数和(自身を含む): 22885824

約数和(自身を除く): 2894503

約数列:

[1, 7, 691, 4133, 4837, 28931, 2855903, 19991321]

約数ペア:

[(1, 19991321), (7, 2855903), (691, 28931), (4133, 4837)]