WordPress numbered pagination

echo "<nav class=\"sw-pagination\">";
    $big = 999999999; // need an unlikely integer
    echo paginate_links( array(
        'base' => str_replace( $big, '%#%', esc_url( get_pagenum_link( $big ) ) ),
        'format' => '?paged=%#%',
        'current' => max( 1, get_query_var('paged') ),
        'total' => $loop->max_num_pages
    ) );
    echo "</nav>";