July 16 (Reuters) - Wall Street’s main indexes opened higher on Friday, with investors piling on economically sensitive energy, banks and travel stocks as data showed U.S. retail sales unexpectedly rose in June. The Dow Jones Industrial Average rose 20.9 points, or 0.06%, at the open to 35007.94. The S&P 500 rose 7.4 points, or 0.17%, to 4367.43, while the Nasdaq Composite rose 54.4 points, or 0.37%, to 14597.508 at the opening bell. (Reporting by Devik Jain in Bengaluru; Editing by Shinjini Ganguli)