This snippet shows you how to list WordPress users by role=administrator

 

$users = get_users('blog_id=1&orderby=nicename&role=administrator');

foreach ($users as $user) {
echo '<li>' . $user->user_login . ' | ' . $user->user_email . ' | ID: ' . $user->ID . '</li>';
}

Result

admin | youradminaccount@test.com | ID: 1
admin2 | youradminaccount2@test.com | ID: 2
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