Answer :

[tex]20=1\cdot1\cdot20\\20=1\cdot2\cdot10\\20=1\cdot4\cdot5\\20=2\cdot2\cdot5\\\\Answer:4\ regular\ prism\\\\1\ \times\ 1\ \times\ 20\\1\ \times\ 2\ \times\ 10\\1\ \times\ 4\ \times\ 5\\2\ \times\ 2\ \times\ 5[/tex]

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