There are two; 29 and 31.
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They are: 23 29 31 and 37
Greatest . . . 37 Smallest . . . 23
37 is a prime number between 30 and 40.
The prime numbers between 20 and 40 are: 23, 29, 31, 37, 41, 43 and 47. 23+29+31+37+41+43+47 = 251
There are four prime numbers between 20 and 40