A resident of an affluent Melbourne suburb could be even richer as officials try to find the mysterious winner of a $20 million prize.

Four people across Victoria, Queensland and Western Australia each won a $20 million slice in last night's $80 million Powerball draw.

But one winner is still unaware of their new multi-millionaire status. 

An unregistered player holds a division one winning ticket purchased at the East Brighton Newsagent in Brighton, Melbourne. 

"That means we don't have any clues to their identity," The Lott's Matt Hart said. 

The man who sold the ticket, East Brighton Newsagent owner Sajjad Sadeghi Goorbandi, believes the winner may be one of his regular customers.

"I wish all the best for them, and for my outlet, for the shop, for the area. It's amazing," he s

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