How to get all divisors of an integer using only pen & paper

Question

Is there any fast approach to get all divisors of an integer by only using pen & paper?

Answer 1

The shortest approach would be to get a rough idea of the squareroot of the integer and then try dividing by all prime numbers starting from least upto that number.

Additional advice, try getting an intuition from the last digits to avoid any unnecessary divisions, for e.g.all multiples of 5 end with $0/5$.