A number is greater than 16 and less than 29. This number has exactly 4 factors. The sum of its factors is 42.
What is the number

6+15+21=42.

Step-by-step explanation:

21 is greater than 16

15 is less than 29

1*21=21

3*7=21

7*3=21

factors of 21 are 1, 3, 7 and 21

1*15=15

3*5=15

5*3=15

factors of 15 are 1, 3, 5 and 15

6+15+21=42

1*6=6

2*3=6

3*2=6

factors of 6 are 1, 2, 3 and 6