Damian Kerr

2022-02-03

What is the composite number between 20 and 40?

iloverayyeb

A composite number is any number which has factors apart from 1 and itself.
So most numbers between 20 and 40 are composite:
$20=2×2×5$
$21=3×7$
$22=2×11$
$24=2×2×2×3$
$25=5×5$
$26=2×13$
$27=3×3×3$
$28=2×2×7$
$30=2×3×5$
$32=2×2×2×2×2$
$33=3×11$
$34=2×17$
$35=5×7$
$36=2×2×3×3$
$38=2×19$
$39=3×13$
$40=2×2×2×5$
The only ' numbers (having no factors apart from 1 and themselves) between 20 and 40 are: 23, 29, 31, 37.

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