No calc please.
NumTheSL5#5
I assume:
\(\begin{array}{|c|c|} \hline n & 12 \text{ positive factors} \\ \hline 60&12\\ \hline 72&12\\ \hline 84&12\\ \hline 90&12\\ \hline 96&12\\ \hline \text{sum }= \mathbf{402} \\ \hline \end{array}\)
