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Below is the top twenty list of the world’s richest people as of 2012:

No. 1 Carlos Slim Helú

Net Worth:$69  billion – As of March 2012
Source: Telecom , Age: 72 , Citizenship: Mexico

No. 2 Bill Gates

Net Worth:$66 billion – As of September 2012
Source: Microsoft, self-made , Age: 56 , Citizenship: U.S.

No. 3 Warren Buffett

Net Worth:$46 billion – As of September 2012
Source: Berkshire Hathaway, self-made , Age: 82 , Citizenship: U.S.

No. 4 Larry Ellison

Net Worth:$41 billion – As of September 2012
Source: Oracle, self-made , Age: 68 , Citizenship: U.S.

No. 4 Bernard Arnault

Net Worth:$41 billion – As of March 2012
Source: LVMH, inherited and growing , Age: 63 , Citizenship: France

No. 6 Amancio Ortega

Net Worth:$37.5 billion – As of March 2012
Source: Zara, self-made , Age: 75 , Citizenship: Spain

No. 7 Charles Koch (tie)

Net Worth:$31 billion – As of September 2012
Source: Diversified, inherited and growing , Age: 76, Citizenship: United States

No. 7 David Koch (tie)

Net Worth:$31 billion – As of September 2012
Source: Diversified, inherited and growing , Age: 71 , Citizenship: United States

No. 9 Eike Batista

Net Worth:$30 billion – As of March 2012
Source: Mining, oil, self-made , Age: 55 , Citizenship: Brazil

No. 10 Christy Walton & family

Net Worth:$27.9 billion – As of September 2012
Source: Walmart, inherited , Age: 57 , Citizenship: U.S.

No. 11 Jim Walton

Net Worth:$26.8 billion – As of September 2012
Source of Wealth: Walmart, inherited , Age: 64 , Citizenship: United States

No. 12 Alice Walton

Net Worth:$26.3 billion – As of March 2012
Source of Wealth: Walmart, inherited , Age: 62 , Citizenship: United States

No. 13 R. Robson Walton

Net Worth: $26.1 billion – As of September 2012
Source of Wealth: Walmart, inherited , Age: 68 , Citizenship: United States

No. 14 Stefan Persson

Net Worth:$26 billion – As of March 2012
Source: Hennes & Mauritz , Age: 64 , Citizenship: Sweden

No. 15 Li Ka-shing

Net Worth:$25.5 billion – As of March 2012
Source: Diversified, self-made , Age: 83 , Citizenship: Hong Kong

No. 16 Karl Albrecht

Net Worth:$25.4 billion – As of March 2012
Source: Aldi, self-made , Age: 92 , Citizenship: Germany

No. 17 Michael Bloomberg

Net Worth:$25 billion – As of September 2012
Source: Bloomberg PL, self-made , Age: 70 , Citizenship: USA

No. 18 Liliane Bettencourt

Net Worth: $24 billion – As of March 2012
Source: L’Oreal, inherited , Age: 89, Citizenship: France

No. 19 Jeff Bezos

Net Worth:$23.2 billion – As of September 2012
Source of Wealth: Amazon.com, self-made , Age: 48, Citizenship: United States

No. 20 Mukesh Ambani

Net Worth:$22.3 billion – As of March 2012
Source: petrochemicals, oil & gas, inherited and growing, Age: 54 , Citizenship: India

[See full list on Forbes.com]