18720485

素因数分解:

$5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{73}}^1\times {\mathrm{431}}^1$

素因数の和:533

約数の個数: 32

約数和(自身を含む): 27620352

約数和(自身を除く): 8899867

約数列:

[1, 5, 7, 17, 35, 73, 85, 119, 365, 431, 511, 595, 1241, 2155, 2555, 3017, 6205, 7327, 8687, 15085, 31463, 36635, 43435, 51289, 157315, 220241, 256445, 534871, 1101205, 2674355, 3744097, 18720485]

約数ペア:

[(1, 18720485), (5, 3744097), (7, 2674355), (17, 1101205), (35, 534871), (73, 256445), (85, 220241), (119, 157315), (365, 51289), (431, 43435), (511, 36635), (595, 31463), (1241, 15085), (2155, 8687), (2555, 7327), (3017, 6205)]