21689759

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{241}}^1$

素因数の和:327

約数の個数: 32

約数和(自身を含む): 28621824

約数和(自身を除く): 6932065

約数列:

[1, 7, 13, 23, 43, 91, 161, 241, 299, 301, 559, 989, 1687, 2093, 3133, 3913, 5543, 6923, 10363, 12857, 21931, 38801, 72059, 72541, 89999, 134719, 238349, 504413, 943033, 1668443, 3098537, 21689759]

約数ペア:

[(1, 21689759), (7, 3098537), (13, 1668443), (23, 943033), (43, 504413), (91, 238349), (161, 134719), (241, 89999), (299, 72541), (301, 72059), (559, 38801), (989, 21931), (1687, 12857), (2093, 10363), (3133, 6923), (3913, 5543)]