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That's the number known as "twenty factorial".

When rounded to the nearest billion, it's 2,432,902,008,000,000,000 .

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10y ago
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Q: What is 20 x 19 x 18 x 17 x 16 x 15 x 14 x 13 x 12 x 11 x 10 x 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1?
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