We can solve this problem by looking at the last digit of the numbers.
A power of 5 always ends with 5, so 5^19 ends with 5.
We also know that \(7^{13}=96889010407\) which ends with 7.
So, we we add up the last digits, we get \(7+5+3 = 15\)
Since it ends with 5, the number must be divisble by 5.
We also know that it can't be divisble by 2 and 3 since neither of \(5^{19} , 7^{13} , 23\) are divisble.
So our final answer is 5.
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