Find $(2^{20} + 2^{20} + 2^{20} +2^{21}) \div 2^{17}$.
As is often the case, calculating $2^{20}$ by brute force is not practical.  Instead, we will try simplifying the expression and combining some terms.  First, note that $2^{21} = 2 \cdot 2^{20}$, because of the definition of an exponent.  So, we can rewrite the expression as $(2^{20} + 2^{20} + 2^{20} + 2 \cdot 2^{20}) \div 2^{17} = 5 \cdot 2^{20} \div 2^{17}$.

Using the division of powers rule, that equals $5 \cdot 2^{20-17} = 5 \cdot 2^3 = 5 \cdot 8 = \boxed{40}$.