Q: Is 20,817 a Prime Number?
A: No, 20,817 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 20817 can be evenly divided by 1 3 9 27 81 257 771 2,313 6,939 and 20,817, with no remainder.
Since 20,817 cannot be divided by just 1 and 20,817, it is not a prime number.