There are infinitely many numbers between 20 and 40.
For example:
21.0000000000135120000001
21.0000000000135120000002
21.000000000013512000000301
21.000000000013512000000302
21.000000000013512000000303
and so on.
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Multiples of 5 are not prime numbers except 5, so there are none. But, there are prime numbers between 20 and 40, like 23, 29, 31 and 37.
There are four prime numbers between 20 and 40
The numbers between 20 and 40 are 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, and 39. These numbers form a consecutive sequence with a common difference of 1. Mathematically, this can be represented as {x | 20 < x < 40}.
There are four. 23,29,31,37
23, 29, 31, 37