Earlier today the prize money had remained unclaimed, with hopeful punters scanning their tickets to see if they'd won big.
And while $19.1m is only half of what could have been won, it's still a hefty pay-packet which could be used to splurge out on a great number of things.
Or, you could be clever with your cash and invest it where you could earn hundreds of thousands of dollars each year.
A spokesperson for Westpac said they'd recommend seeking independent financial advice to ensure it was invested in ways to reflect your savings goals.
That would likely include consideration of a range of options with higher earning potential, such as managed funds.
But assuming you would qualify for the bonus rate every month, you could earn over $300,000 in after-tax interest, the spokesperson said.
"Putting the full amount in our Westpac Bonus Saver account would earn $180,334 in after-tax interest in the first year.
"Putting $19 million in a 12-month term deposit and the remaining $142,857 in a Westpac Bonus Saver account would earn $345,056 in after-tax interest in the first year."
Meanwhile, an approximate interest yield for accounts could earn you between $9000 and $250,000 each year with ANZ, a spokesperson said.
Through the serious saver 1.30 per cent scheme over 12 months, one could earn a whopping $249,161.87.
An online account or private reserve with 0.05 per cent over 12 months, one could earn $9,528.22.
Elsewhere, approximate yields for a ANZ term deposit between one year and five years could earn you anywhere between $500,000 to $2m in interest.
• 1 Year @ 2.70%p.a = $513,000; • 3 Year @ 2.60%p.a = $1,482,000; • 5 Year @ 2.70%p.a = $2,656,000.