Answer
$20.91^{\circ}$
Work Step by Step
$20^{\circ}54'36''=20^{\circ}+\frac{54}{60}^{\circ}+\frac{36}{3600}^{\circ}$
$=20^{\circ}+0.9^{\circ}+0.01^{\circ}=20.91^{\circ}$
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