That means that you multiply 20 by itself, using it 20 times as a factor:20 x 20 x 20 x ... x 20 (a total of 20 factors).
You can calculate this in Excel, writing the following formula:
= 20^20
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20²⁰ = (2 × 10)²⁰ = 2²⁰ × 10²⁰ = 1048576 × 10²⁰ = 1.048576 × 10²⁶
= 104,857,600,000,000,000,000,000,000 (in full).
To say 10 raised to the power of 20, you would read it as "10 to the power of 20" or "10 raised to the 20th power." This means multiplying 10 by itself 20 times, resulting in the number 100,000,000,000,000,000,000.
1.02^(20) = 1.485947396... ~ 1.49
203 = 20 x 20 x 20 = 8,000
204 = 20 x 20 x 20 x 20 = 160000
4 to the 20 power is 1099511627776