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@divisors = grep { $number % $_ == 0 } 1 .. $number;

# First, the lower half of the divisors:
@divisors = grep { $number % $_ == 0 } 1 .. sqrt($number);
# Then, the upper half:
push @divisors, map {$number == $_*$_ ? () : $number/$_} reverse @divi
+sors;