20 = 20^1 so for base 20, the exponent is 1.
20 = 10^1.3020 (approx) so for base 10, the exponent is 1.3010
20 = 2^4.3219 (approx) so for base 2, the exponent is 4.3219
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20 with an exponent of 2 means 20 squared, or 20 times 20, or 400. An exponent of 3 means 20 cubed, or 20 times 20 times 20, or 8000. The exponents work as they do for any other base.
no exponent can make a number equal to zero, however any number with an exponent of zero is one.
A number to a negative exponent is the inverse of the number to the positive exponent. That is, x-a = 1/xa
The square of a number can be represented by writing the number with an exponent of 2, whereas the square root of the number is represented by writing the number with an exponent of 1/2.
You multiply the whole number as many times as the exponent is.