Germany, officially the Federal Republic of Germany, is a country in Central Europe. It is bordered to the north by the North Sea, Denmark, and the Baltic Sea; to the east by Poland and the Czech Republic; to the south by Austria and Switzerland; and to the west by France, Luxembourg, Belgium, and the Netherlands. The territory of Germany covers 357,021 square kilometers and is influenced by a temperate seasonal climate. With 81.8 million inhabitants in 2010, it has the largest population among member states of the European Union, and it is home to the third-largest number of international migrants worldwide. Germany is a federal parliamentary republic of sixteen states. The capital and largest city is Berlin. Germany is a member of the United Nations, NATO, G8, G20, and the OECD. It is a major power with the world's fourth largest economy by nominal GDP and the fifth largest in purchasing power parity. It is the second largest exporter and third largest importer of goods. In absolute terms, Germany allocates the second biggest annual budget of development aid in the world.