Q: Is 19,720 a Prime Number?
A: No, 19,720 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 19720 can be evenly divided by 1 2 4 5 8 10 17 20 29 34 40 58 68 85 116 136 145 170 232 290 340 493 580 680 986 1,160 1,972 2,465 3,944 4,930 9,860 and 19,720, with no remainder.
Since 19,720 cannot be divided by just 1 and 19,720, it is not a prime number.