21978116

素因数分解:

$2^2\times {\mathrm{79}}^1\times {\mathrm{157}}^1\times {\mathrm{443}}^1$

素因数の和:683

約数の個数: 24

約数和(自身を含む): 39285120

約数和(自身を除く): 17307004

約数列:

[1, 2, 4, 79, 157, 158, 314, 316, 443, 628, 886, 1772, 12403, 24806, 34997, 49612, 69551, 69994, 139102, 139988, 278204, 5494529, 10989058, 21978116]

約数ペア:

[(1, 21978116), (2, 10989058), (4, 5494529), (79, 278204), (157, 139988), (158, 139102), (314, 69994), (316, 69551), (443, 49612), (628, 34997), (886, 24806), (1772, 12403)]