Number 20: David Thomson
52-year-old Canadian billionaire David Thomson is the chairman of Thomson Reuters. Together with his family, including soap star Taylor Thomson, his net worth is $19 billion.
Check out 19 more such Richie Rich's after the jump.
Number 19: Prince Alwaleed Bin Talal Alsaud
55-year-old Saudi Arabian prince, Alwaleed Bin Talal Alsaud, is an international investor and entrepreneur. He is worth $19.4 billion.
Number 18: S. Robson Walton
The eldest son of Wal-Mart founder Sam Walton, 66-year-old S. Robson Walton is currently the chairman of the worldwide company. This American heir and businessman is worth $19.8 billion, falling just under the wealth of his younger siblings.
Number 17: Liliane Bettencourt
87-year-old French heiress, socialite and businesswoman Liliane Bettencourt is the principal shareholder to L'Oreal. She is worth $20 billion.
Number 16: Alice Walton
(Justin Sullivan/Getty Images)
Another heir to the Wal-Mart empire, 60-year-old Alice Walton is the daughter of the superstore founder, Sam Walton. She is worth $20.6 billion.
Number 15: Jim Walton
American businessman and chairman of Arvest Bank, Jim Walton is the youngest son of Wal-Mart founder Sam Walton. The 62-year-old is worth $20.7 billion.
Number 14: Li Ka-shing
China's Li Ka-shing is chairman of both Hutchison Whampoa Limited (HWL) and Cheung Kong Holdings. The 81-year-old is worth $21 billion.
The world's 20 top billionaires, as named by Forbes Magazine.
Number 13: Stefan Persson
Founder of chic fashion retailer H&M, 62-year-old Stefan Persson is a Swedish billionaire. He has a net worth of $22.4 billion.
Number 12: Christy Walton and Family
Wife of late John T. Walton, 55-year old Christy Walton and her branch of the Walton family are heirs to the Wal-Mart fortune. They are worth $22.5 billion.
Number 11: Ingvar Kamprad and Family
Ingvar Kamprad is a Swedish entrepreneur and founder of IKEA. The 83-year-old and his family are worth $23 billion.
Number 10: Karl Albrecht
90-year-old German entrepreneur Karl Albrecht's net worth is $23.5 billion. Albrecht co-founded the popular supermarket chain Aldi.
Number 9: Amancio Ortega
Worth $25 billion, Spanish billionaire Amancio Ortega is the chairman of the Inditex Group. He is 74.
Number 8: Eike Batista
Eike Batista is a Brazilian entrepreneur and founder of several companies, predominantly in the mining industry. At 53, he is worth $27 billion.
Number 7: Bernard Arnault
61-year-old French CEO of LVMH, the conglomerate of luxury brands Louis Vuitton and Dior, is worth $27.5 billion.
The world's 20 top billionaires, as named by Forbes Magazine.
Number 6: Lawrence Ellison
Lawrence Ellison is an American entrepreneur, co-founder and CEO of Oracle Corporation. At 65 years of age, he is worth $28 billion.
Number 5: Lakshmi Mittal
Lakshmi Mittal is a 59-year-old Indian CEO and the current vice president of the World Steel Association. Mittal is worth $28.7 billion.
Number 4: Mukesh Ambani
52-year-old Indian business tycoon Mukesh Ambani is chairman of Reliance Industries. He's worth $29 billion.
The world's 20 top billionaires, as named by Forbes Magazine.
Number 3: Warren Buffett
79-year-old American investor Warren Buffett is worth $47 billion.
Number 2: Bill Gates
American Microsoft co-founder and chairman, 54-year-old William Gates III has a net worth of $53 billion.
And the billionaire is...
Mexico's Carlos Slim Helu and his family have a net worth of $53.5 billion, due in large part to Slim's telecommunications business endeavors.
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