Not sure what you're asking, but here are some examples of numbers that have a tens digit less than the ones digit: 13, 205, 1367, 29.632
All of the composite numbers less than 100 have factor pairs.
Numbers less than 100 having 19 as a factor are 19, 38, 57, 76, and 95.
The number can be any one of these four numbers:640751862973
When they have a factor in common greater than one.
Is it only 890 and 891
18 numbers are there
A single digit prime number