18989789

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{211}}^1$

素因数の和:297

約数の個数: 32

約数和(自身を含む): 25073664

約数和(自身を除く): 6083875

約数列:

[1, 7, 13, 23, 43, 91, 161, 211, 299, 301, 559, 989, 1477, 2093, 2743, 3913, 4853, 6923, 9073, 12857, 19201, 33971, 63089, 63511, 89999, 117949, 208679, 441623, 825643, 1460753, 2712827, 18989789]

約数ペア:

[(1, 18989789), (7, 2712827), (13, 1460753), (23, 825643), (43, 441623), (91, 208679), (161, 117949), (211, 89999), (299, 63511), (301, 63089), (559, 33971), (989, 19201), (1477, 12857), (2093, 9073), (2743, 6923), (3913, 4853)]