Q: Is 20,505 a Prime Number?
A: No, 20,505 is not a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 20505 can be evenly divided by 1 3 5 15 1,367 4,101 6,835 and 20,505, with no remainder.
Since 20,505 cannot be divided by just 1 and 20,505, it is not a prime number.