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20 is a pronic number.; 20 is a tetrahedral number as 1, 4, 10, 20.; 20 is the basis for vigesimal number systems.; 20 is the third composite number to be the product of a squared prime and a prime, and also the second member of the (2 2)q family in this form.; 20 is the smallest primitive abundant number.; An icosahedron has 20 faces. A dodecahedron has 20 vertices.Pulp magazines (often referred to as the pulps) were inexpensive fiction magazines that were published from 1896 to the late 1950s.The term pulp derives from the cheap wood pulp paper on which the magazines were printed. In contrast, magazines printed on higherquality paper were called glossies or slicks. The typical pulp magazine had 128 pages; it was 7 inches (18 cm) …
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