23 and 29.
There are two prime numbers between 20 and 30 which are 23 and 29
20 has two prime factors which are 2 and 5
7 + 13 = 20 Note that there are no two prime numbers x and y that multiply to 20.
The next prime numbers, after 20, are: 23, 29, 31, 37, ...
The first prime above 20 is 23, and then all others (29 is the next).
The median for the first 20 prime numbers would be 30. This is because the middle two numbers of the first 20 prime numbers are 29 and 31. To find the median from this, we need to find the average of these two numbers. This is 30.
The first two consecutive prime numbers that have a difference of 20 are the numbers 887 and 907.
They are 3+17 = 20
To work this out, you need to write both numbers as their prime factors: 20 = 2x2x5 12 = 2x2x3 The next step is to identify any common prime factors. In this case both numbers have two 2s as prime factors. Multiply these together and you get 4. Therefore 4 is the HCF of 20 and 12.
13 and 7
The prime numbers between 15 and 20 are 17 and 19. To find the product of these two prime numbers, you simply multiply them together: 17 x 19 = 323. Therefore, the product of the prime numbers between 15 and 20 is 323.
17 and 3 are two prime numbers whose sum is 20. Their product is 51.