Q: Is 20,420 a Prime Number?
A: No, 20,420 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 20420 can be evenly divided by 1 2 4 5 10 20 1,021 2,042 4,084 5,105 10,210 and 20,420, with no remainder.
Since 20,420 cannot be divided by just 1 and 20,420, it is not a prime number.