Outputting a file with custom field

I have a page template that outputs a custom post type. It all works fine except for outputting a custom field with a downloadable file. The custom field is labelled ‘research-file’. I am using this code to attempt to show the file on the page – echo ‘<p>’ . genesis_get_custom_field( ‘research-file’ ). ‘</p>’; //retrieve research file;

However, all that displays is a number. Can some one help with this please. Thank you for any assistance.