The Commutative Property of Multiplication states that the order in which two numbers are multiplied does not change the product. In the case of the expression \( a^{20} \cdot x^3 \), you can rearrange the factors.
Using the Commutative Property, you can rewrite \( a^{20} \cdot x^3 \) as:
\[ x^3 \cdot a^{20} \]
So, the expression rewritten using the Commutative Property of Multiplication is \( x^3 \cdot a^{20} \).