Question

What number is less than 20 and has 3 factor pairs?

Answer 1

All numbers less than 20 with 3 factor pairs are:

• 
  `12 = 1\cdot 12 = 2\cdot 6 = 3\cdot 4`
• 
  `16 = 1\cdot 16 = 2\cdot 8 = 4\cdot 4`
• 
  `18 = 1\cdot 18 = 2\cdot 9 = 3\cdot 6`