They are: 12 14 15 16 18 and 20 because they all have more than two factors
11, 13, 17, and 19
The prime numbers between 10 and 20 are 11, 13, 17, and 19.
11 13 17 19
five (including 20)
2,7,11 2 x 7 x 11 = 154 2 + 7 + 11 = 20
The prime numbers between 10 and 20 are 11, 13, 17, and 19.
Just 1.
They are: 2+7+11 = 20
The numbers 20 and 11 can go into various larger numbers, but one common multiple they both divide evenly into is 220. This is because 220 is the least common multiple (LCM) of 20 and 11, as 220 is divisible by both numbers without leaving a remainder.
There are way more than 20 prime numbers, since there are infinite numbers.
9 and 11
20 and 11