This is the 685th most frequent Japanese word.
少なく
"少なく" means "few" or "little" in English.
Here, '少なくとも' means 'at the very least', used to indicate a minimum condition or amount in a statement.
少なくとも手助けが必要なら、教えてください。
At the very least, if you need help, please let me know.
In this sentence, '少なくない' translates to 'not a few' or 'considerable', implying that the number is more significant than one might typically expect.
私たちのコミュニティで問題を感じた人は少なくない。
There are not a few people who have felt a problem in our community.
Here, '少なく' is simply used to mean 'less' or 'minimal', to indicate making something smaller or shorter in quantity or duration.