19898879

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{103}}^1\times {\mathrm{193}}^1$

素因数の和:327

約数の個数: 32

約数和(自身を含む): 27116544

約数和(自身を除く): 7217665

約数列:

[1, 7, 11, 13, 77, 91, 103, 143, 193, 721, 1001, 1133, 1339, 1351, 2123, 2509, 7931, 9373, 14729, 14861, 17563, 19879, 27599, 103103, 139153, 193193, 218669, 258427, 1530683, 1808989, 2842697, 19898879]

約数ペア:

[(1, 19898879), (7, 2842697), (11, 1808989), (13, 1530683), (77, 258427), (91, 218669), (103, 193193), (143, 139153), (193, 103103), (721, 27599), (1001, 19879), (1133, 17563), (1339, 14861), (1351, 14729), (2123, 9373), (2509, 7931)]