19997263

素因数分解:

${\mathrm{11}}^1\times {\mathrm{13}}^2\times {\mathrm{31}}^1\times {\mathrm{347}}^1$

素因数の和:415

約数の個数: 24

約数和(自身を含む): 24454656

約数和(自身を除く): 4457393

約数列:

[1, 11, 13, 31, 143, 169, 341, 347, 403, 1859, 3817, 4433, 4511, 5239, 10757, 49621, 57629, 58643, 118327, 139841, 645073, 1538251, 1817933, 19997263]

約数ペア:

[(1, 19997263), (11, 1817933), (13, 1538251), (31, 645073), (143, 139841), (169, 118327), (341, 58643), (347, 57629), (403, 49621), (1859, 10757), (3817, 5239), (4433, 4511)]