Andrew Jackson, the nation's seventh president, is getting a make-over.

Not a new haircut or new clothes but a new look on the $20 bill.Like Benjamin Franklin's $100 and Ulysses S. Grant's $50, Jackson's $20 is being updated with anti-counterfeiting features, including an enlarged, off-center portrait.

The Treasury Department said Monday that Secretary Robert Rubin and Federal Reserve Chairman Alan Greenspan would reveal the new design on May 20 but the bills wouldn't show up in automated teller machines and cash drawers before the fall.

In the meantime, the department was preparing a public education effort to persuade Americans to stop and look at money they receive before tucking it into their wallets.

Even the most sophisticated anti-counterfeiting features don't work if cash handlers don't check for them. After the introductions of the new $100 note in March 1996 and the new $50 last October, bankers said some businesses were stuck with bogus bills simply because employees weren't familiar with the new designs.

"In a way it's a tribute to the job the Secret Service does that people don't give a thought to the bills they receive," said Howard Schloss, assistant Treasury secretary.

"But one of the things we'll be stressing is that people should take a couple of moments to authenticate bills," he said.

Jackson's portrait on the new bills will be surrounded by very fine, hard-to-duplicate concentric lines. And, like the $100s and $50s, a watermark in the shape of the portrait, only smaller, will be visible when the bill is held up to a light.