Nauru is about 17,001 times smaller than Germany.

Germany is approximately 357,022 sq km, while Nauru is approximately 21 sq km, making Nauru 0.01% the size of Germany. Meanwhile, the population of Germany is ~84.3 million people (84.3 million fewer people live in Nauru).
Tip: This to-scale comparison of Germany vs. Nauru uses the Mercator projection, which distorts the size of regions near the poles.