21, & 28.
Because
7 x 3 = 21
7 x 4 = 28
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24 and 28
The numbers 23 and 29 are the only prime numbers between 20 and 30
The prime numbers between 20 and 30 are 23 and 29.
20 is not a factor of 30
HCF is the highest common factor of two or more numbers. HCF of 20 and 30 is 10.