Math, Science, and Technology Monday

I got this problem from http://www.theproblemsite.com/games/secretnumber2.asp. There are several games, so you could do this all day if you so desire. Here is an example of one of the problems.

I am thinking of a 3-digit numbers. Can you guess my number from the following information? 

1. The product of the first two digits is less than 20
2. The difference of the first two digits is greater than 3
3. The difference of the last two digits is less than 4
4. The difference of the first and last digits is less than 5
5. The product of the first and last digits is equal to 20