Characteristic polynomial
$$\begin{equation}\lambda \left(\lambda + 4\right)^{5} \left(\lambda + 5\right)^{2} \left(\lambda - 4\right)^{2} \left(\lambda^{2} + 2 \lambda + 17\right) \left(\lambda^{4} - 12 \lambda^{3} + 16 \lambda^{2} - 384 \lambda + 320\right)\notag\end{equation}$$
Minimal polynomial
$$\begin{equation}\lambda \left(\lambda + 4\right)^{2} \left(\lambda + 5\right) \left(\lambda - 4\right) \left(\lambda^{2} + 2 \lambda + 17\right) \left(\lambda^{4} - 12 \lambda^{3} + 16 \lambda^{2} - 384 \lambda + 320\right)\notag\end{equation}$$
Quantum multiplication matrix
$$\begin{equation}\begin{pmatrix}0 & 2 & 2 & 4 & 8 & 0 & 6 & 6 & 6 & 6 & 24 & 16 & 16 & 32 & 32 & 40 \\ 1 & -1 & 1 & 0 & 0 & 0 & 4 & 8 & 0 & 0 & 4 & 6 & 6 & 18 & 6 & 16 \\ 1 & 1 & -1 & 0 & 0 & 0 & 0 & 0 & 4 & 8 & 4 & 6 & 6 & 6 & 18 & 16 \\ 1 & 1 & 1 & -1 & 2 & 2 & 0 & 0 & 0 & 0 & 4 & -6 & 0 & 0 & 0 & 0 \\ 1 & 0 & 0 & 1 & 0 & 0 & 2 & 2 & 2 & 2 & 4 & 6 & 0 & 6 & 6 & 16 \\ 0 & 1 & 1 & -2 & 0 & -2 & -2 & 0 & -2 & 0 & -4 & 0 & 8 & 4 & 4 & 12 \\ 0 & 1 & 0 & 2 & 0 & 1 & -1 & 2 & 2 & 0 & 2 & 0 & 0 & 4 & 0 & 0 \\ 0 & 1 & 0 & 0 & 1 & 0 & 1 & -1 & 0 & 1 & 0 & 2 & 0 & 4 & 0 & 6 \\ 0 & 0 & 1 & 2 & 0 & 1 & 2 & 0 & -1 & 2 & 2 & 0 & 0 & 0 & 4 & 0 \\ 0 & 0 & 1 & 0 & 1 & 0 & 0 & 1 & 1 & -1 & 0 & 2 & 0 & 0 & 4 & 6 \\ 0 & 0 & 0 & 1 & 2 & 0 & 0 & 1 & 0 & 1 & 0 & 0 & 2 & 2 & 2 & 0 \\ 0 & 0 & 0 & 0 & 0 & 1 & 2 & 0 & 2 & 0 & 0 & -1 & 2 & 2 & 2 & 4 \\ 0 & 0 & 0 & 0 & 0 & 1 & 0 & 1 & 0 & 1 & -4 & 1 & -2 & -2 & -2 & 0 \\ 0 & 0 & 0 & 0 & 0 & 0 & 1 & 2 & 0 & 0 & 3 & 0 & 1 & 0 & 2 & 2 \\ 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 1 & 2 & 3 & 0 & 1 & 2 & 0 & 2 \\ 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 1 & 2 & 3 & 3 & 0\end{pmatrix}\notag\end{equation}$$