Yeah, 4 employees out of 20.

The fact this department even existed is a mystery to me. They didn't even screen candidates or participate in interviews. It was basically 4 glorified secretaries. To be fair they also managed the payrolls, which consisted of sending the same excel file to he accountant each week. Realistically we would only have needed 1 person to keep track of whatever might pop up and to make sure the payroll system was up to date. The owners liked to screen and do the interviews themselves.

At some other place I worked we had 1 admin/accountant person working like 1 or 2 days a week for a business of about 40 employees. Again the owners were taking care of new hires.

HR as a department seems largely useless unless you're hiring 365 days a year and have so many employees that you can't keep up with all the requests. HR people are usually terrible at screening candidates anyway.