It's about one-fifty-fifth as heavy as a Polar Bear.
In other words, the weight of a Polar Bear is 56.80 times 20 pounds.(Ursus maritimus) (adult, male)
An adult, male polar bear weighs between 1,140 pounds. Polar bears are so heavily insulated by their 9.9 cm (3.9 in) layer of blubber that they are often difficult to detect using infrared photography sensors.
It's about one-fifty-fifth as heavy as a Grizzly Bear.
In other words, the weight of a Grizzly Bear is 57.50 times 20 pounds.(a.k.a. brown bear, a.k.a. silver bear, Ursus arctos horribilis) (Adult, male, coastal area population average)
An adult, male grizzly bear from a coastal area (where food is plentiful) can weigh up to 1,150 pounds. In spite of their tremendous size, grizzly bears can run at speeds of up to 55 kph (34 mph).
It's about 60 times as heavy as a Baseball.
In other words, 20 pounds is 62.4390243902440 times the weight of a Baseball, and the weight of a Baseball is 0.016015625 times that amount.(MLB rules)
Per Major League Baseball rules, a baseball must weigh between 0.31250 pounds and 0.3281250 pounds. A major league pitcher can throw a baseball at up to 150 kph (91 mph) (with a fastball pitch), with record-setting pitches as fast as 171 kph (106 mph).
It's about 65 times as heavy as a Battery (D).
In other words, 20 pounds is 67.20 times the weight of a Battery (D), and the weight of a Battery (D) is 0.0149 times that amount.(Alkaline)
A "D" size battery weighs 0.2980 pounds. The D size battery is the oldest of the modern battery sizes, first invented by the National Carbon Company in 1898.
It's about one-seventy-fifth as heavy as a Cow.
In other words, the weight of a Cow is 77 times 20 pounds.(for Holstein, a.k.a. Holstein Friesian, a.k.a. Friesian, Bos primigenius) (adult, heifer)
A mature Holstein cow (the well-known black-and-white, spotted breed of cow) typically weighs 1,500 pounds. President William Howard Taft (1909 - 1913) kept a Holstein cow named Pauline Wayne on the White House grounds — a gift from a Wisconsin senator and the source of the First Family's milk.
It's about 95 times as heavy as a Deck of Cards.
In other words, the weight of a Deck of Cards is 0.01 times 20 pounds.(ISO 216 B8 size, a.k.a. "poker size" 63 x 88 mm, 52-card deck)
A deck of 52 ISO 216 B8-size playing cards weighs 0.210 pounds. Utilizing nearly 3,700 decks, the record-holding largest card tower was built in early 2010, stood over 3.5 m (11 ft), and weighed over 500 pounds.
It's about 150 times as heavy as a Battery (C).
In other words, the weight of a Battery (C) is 0.0071 times 20 pounds.(Alkaline)
A "C" size battery weighs 0.140 pounds. C batteries are typically used in medium-drain devices such as musical instruments.