19870039

素因数分解:

$7^2\times {\mathrm{31}}^1\times {\mathrm{103}}^1\times {\mathrm{127}}^1$

素因数の和:275

約数の個数: 24

約数和(自身を含む): 24281088

約数和(自身を除く): 4411049

約数列:

[1, 7, 31, 49, 103, 127, 217, 721, 889, 1519, 3193, 3937, 5047, 6223, 13081, 22351, 27559, 91567, 156457, 192913, 405511, 640969, 2838577, 19870039]

約数ペア:

[(1, 19870039), (7, 2838577), (31, 640969), (49, 405511), (103, 192913), (127, 156457), (217, 91567), (721, 27559), (889, 22351), (1519, 13081), (3193, 6223), (3937, 5047)]