【Question 4】We know that $0,1,2,3, \ldots$ are called natural numbers. Natural numbers greater than 1 that can only be divided by 1 and themselves are called prime numbers, such as $2,3,5,7,11$, etc. The sum of all prime numbers that can divide 2015 is $\qquad$ _.
$$
\begin{array}{l}
2015=5 \times 13 \times 31 \\
5+13+31=49
\end{array}
$$

Analysis:
The given text is already a mathematical expression and does not require translation. However, if you need the text to be described in English, it would be:

$$
\begin{array}{l}
2015=5 \times 13 \times 31 \\
5+13+31=49
\end{array}
$$

This shows that 2015 can be factored into 5, 13, and 31, and the sum of these factors is 49.