The sum of two prime numbers is 20 and the product is 51. What's the difference between them

The sum of two prime numbers is 20 and the product is 51. What's the difference between them

20=3+17=7+13
3×17=51
7×13=91≠51
So these two prime numbers are 7 and 13, respectively
The difference is 17-3 = 14