Indonesia's republican form of government includes an elected legislature and president. Indonesia has 34 provinces, of which five have Special Administrative status. Its capital city is Jakarta. The country shares land borders with Papua New Guinea, East Timor, and the Malaysian Borneo. Other neighbouring countries include Singapore, the Philippines, Australia, Palau, and the Indian territory of the Andaman and Nicobar Islands. Indonesia is a founding member of ASEAN and a member of the G-20 major economies. The Indonesian economy is the world's 16th largest by nominal GDP and the 8th largest by GDP at PPP.