SEOUL, Nov 23 (Reuters) - South Korean exports grew 11.1% in the first 20 days of November from the same period a year earlier, government data showed on Monday, reversing a 5.9% decline in the previous month, helped by strong chip sales and overseas demand. Shipments of chips surged 21.9%, while those of cars and mobile phones jumped 11.9% and 36.2% each. A breakdown of data also showed exports to China, United States and European Union expanded by 7.2%, 15.4% and 31.4%, respectively. Imports rose 1.3% in the first 20 days of the month. Full-month trade data will be released on Dec. 1. (Reporting by Joori Roh; Editing by Kim Coghill)