Adelaide woman realises she won entire Christmas $20m Powerball jackpot

An Adelaide retiree has just become a multimillionaire after realising she scooped the entire Christmas $20 million Powerball jackpot.

The Hackham woman had the the only division one winning entry nationally in the draw last Thursday on Christmas night.

"I had no idea until I checked the ticket just now," the woman told The Lott today.

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"It's been in my purse the whole time, but I had a lot going on this week so hadn't got around to checking it.

"I'd heard that a winning ticket has been sold and hadn't been claimed.

"I had a bit of a smile on my face just in case it was me, but never in million years would I have thought I'd won $20 million."

The woman said she would use some of the money to help her family and give to some of her favourite charities.

"A lot of people could do a lot of good with this money," the woman said.

"I always like to give where I can, no matter what amount.

"Now I can give a little more."

The winning entry was purchased at Colonnades Lotto Kiosk, Shop KI104 Noarlunga Centre, 54 Beach Road, Noarlunga Centre.

The winning numbers in Powerball draw 1545 were 7, 23, 29, 20, 11, 16 and 17. The all-important Powerball number was 17.

There are many different ways to get help and information about gambling. You can visit the National Gambling Helpline or call on 1800 858 858.