the minimum hardware requirement for SAP S/4hana System on Azure/AWS

Hi

I'm planning to install an S/4hana system on Azure/AWS which will be used by 20 users with finance, sales, procurement, inventory moudles, etc. What is the minimum hardware requirement?

I know S/4 hana application and HANA DB can be installed together on a single box. What is the h/w requirement in this scenario?

If we add frontend server to the above box, how much additional resources required?

How about gateway and webdispatcher? Are they required? If so, can they be clubbed in the above box?

Thanks

May Thae