How do you simplify 20^(1/2) *20^(1/2)?

${x}^{a} \cdot {x}^{a} = {x}^{a + a}$
${20}^{\frac{1}{2}} \cdot {20}^{\frac{1}{2}} = {20}^{\frac{1}{2} + \frac{1}{2}} = {20}^{1} = 20$