A twenty-dollar bill is a denomination of United States currency. It features the portrait of Andrew Jackson, the seventh President of the United States, on the front. The bill is primarily green and has various security features, including a security thread and a watermark, to prevent counterfeiting. The back of the twenty-dollar bill displays an image of the White House, the official residence of the President. The bill is commonly used for everyday transactions and is one of the most circulated denominations in the U.S. currency system.