If you want to retire a millionaire with little effort, consider investing in exchange-traded funds, or ETFs. With an ETF, your money typically gets invested in many different stocks -- sometimes even hundreds or thousands. You don't have to do the work of picking enough individual stocks to diversify your portfolio. Instead, you're automatically diversified with a single purchase.

Global investment firm (NYSE: IVZ) has several ETFs that could help you take your retirement funds to the next level. With enough time and patience, these three Invesco ETFs could help make you a millionaire by the time you retire.

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Source Fool.com