But since $i is not used:

use strict;
use warnings;

my $number = 8;

for (1 .. 20) {
    print "present value of the number is:", $number++, "\n";
}


# or

print "present value of the number is:", $number++, "\n" for 1 .. 20;
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make the number of iterations clearer and make it clear that the value of the count is unimportant.