Respuesta :

Answer:

7 numbers

2 , 3 , 5 , 7 , 11 , 13 , 17 , 19

Step-by-step explanation:

Only a prime number has exactly 2 positive divisors which are 1 and himself

and the prime numbers less than 20 are : 2 , 3 , 5 , 7 , 11 , 13 , 17 , 19

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