Q: Is 20,820 a Prime Number?
A: No, 20,820 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 20820 can be evenly divided by 1 2 3 4 5 6 10 12 15 20 30 60 347 694 1,041 1,388 1,735 2,082 3,470 4,164 5,205 6,940 10,410 and 20,820, with no remainder.
Since 20,820 cannot be divided by just 1 and 20,820, it is not a prime number.