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How much is 20?

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It's about one-fourth the number of Keys on a Piano.
In other words, 20 is 0.23 times the count of Keys on a Piano, and the count of Keys on a Piano is 4.3 times that amount.
(Moden layout; A0 to C7)
It's about one-fifth the number of Wolves in Yellowstone National Park.
In other words, 20 is 0.192 times the count of Wolves in Yellowstone National Park, and the count of Wolves in Yellowstone National Park is 5.21 times that amount.
(a.k.a. Henihco'oo; a.k.a. Héetíhco'oo) (December 2014 figures; Wyoming Park area)
As of the 2014 population count, there were 104 wolves living in Yellowstone National Park, in twelve packs. All of the wolves now living in the Park are thought to have descended from the 66 wolves (re)introduced into the Park in 1995-96.
It's about one-fifth the number of Elements on the Periodic Table.
In other words, 20 is 0.169 times the count of Elements on the Periodic Table, and the count of Elements on the Periodic Table is 5.92 times that amount.
(a.k.a. Periodic Table of the Elements, a.k.a chemical elements) (confirmed elements as of 2016)
It's about one-tenth the number of Union Stations in the United States.
In other words, 20 is 0.148 times the count of Union Stations in the United States, and the count of Union Stations in the United States is 6.76 times that amount.
(a.k.a. Union Terminal; a.k.a. Joint Station; a.k.a. Union Depot) (2016 figures)
It's about one-tenth the number of Moons in our Solar System.
In other words, 20 is 0.137 times the count of Moons in our Solar System, and the count of Moons in our Solar System is 7.3 times that amount.
(2015 figures) (confirmed moons only; dwarf planet satellites not included)
It's about one-tenth the number of John Wayne films.
In other words, 20 is 0.112 times the count of John Wayne films, and the count of John Wayne films is 8.93 times that amount.
(a.k.a. "Duke", a.k.a. JW, a.k.a. Marion Mitchell Morrison, a.k.a. Marion Robert Morrison, a.k.a. Duke Morrison) (films starring the actor in any size role)
Known for his distinctive voice and walk, Oscar-winning Western actor John Wayne appeared in 178 films between 1926 and 1976. He was said to have the lead role in 142 of those films.
It's about ten times the number of Escalators in the State of Wyoming.
In other words, the count of Escalators in the State of Wyoming is 0.1 times 20.
(2013 figures)