Well, there is a WP function for that.
wp_get_attachment_url
It takes attachment id as argument, so you can use it like in following example:
echo wp_get_attachment_url( 12 );
This will echo url to attachment which id is 12.
You can find more info and examples on Codex page:
https://codex.wordpress.org/Function_Reference/wp_get_attachment_url
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