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How much is 20?

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It's about one-and-three-tenths times the number of Living Kings and Queens.
In other words, the count of Living Kings and Queens is 0.770 times 20.
(2015 figures) (distinct Monarchs)
As of 2015, the world has fifteen Kings and Queens reigning over 45 countries. Of all these, Queen Elizabeth the II is the only reigning Queen; she has monarchical authority over the sixteen of the Commonwealth nations.
It's about seven-tenths the number of Countries in the European Union.
In other words, 20 is 0.710 times the count of Countries in the European Union, and the count of Countries in the European Union is 1.40 times that amount.
(a.k.a. EU) (2016 figures)
There are 28 member countries in the European Union, the latest member of which is Croatia. The EU is largely urban, with sixteen cities having a population of one million or more, and 75% of the population living in an urban area.
It's about two times the number of Symphonies Composed by Beethoven.
In other words, 20 is 2.222222222220 times the count of Symphonies Composed by Beethoven, and the count of Symphonies Composed by Beethoven is 0.450 times that amount.
(a.k.a. Ludwig van Beethoven)
Over the course of his life, Beethoven composed nine symphonies over the course of a twenty-four year period. After his death in early 1827, an estimated 20,000 Austrian citizens attended his public funeral.
It's about two-fifths the number of Teeth in a Great White Shark's Mouth.
In other words, 20 is 0.420 times the count of Teeth in a Great White Shark's Mouth, and the count of Teeth in a Great White Shark's Mouth is 2.40 times that amount.
(Carcharodon carcharias) (average; including developing rows)
A Great White Shark has 48 exposed teeth on their upper and lower jaws. Behind these exposed teeth are developing teeth — up to 300 in about 5 rows. The sharks will continuously lose and replace the exposed teeth throughout their lives.
It's about two-fifths the number of Countries in Africa.
In other words, 20 is 0.370 times the count of Countries in Africa, and the count of Countries in Africa is 2.70 times that amount.
(2016 figures) (sovereign states recognized by the UN only)
It's about three-tenths the number of Submarines in the US Navy.
In other words, 20 is 0.280 times the count of Submarines in the US Navy, and the count of Submarines in the US Navy is 3.60 times that amount.
(a.k.a. Subs) (includes all types, all classes) (2015 figures)
It's about four times the number of Living U.S. Presidents.
In other words, the count of Living U.S. Presidents is 0.30 times 20.
(a.k.a. Presidents of the United States; a.k.a. Presidents of the United States of America; a.k.a. POTUS), (2016 figures) (including current)