20,000 is a good amount to open a business from home. Just choose whatever you are good at and start.
For example, if the business is related to food, try to open an Instagram account and sell food to your relatives. While if the project is car batteries, you can start with 20 batteries. Moreover, you can provide a service of adjusting the batteries at the same price as the sale price in the market, which makes it a way to attract customers. Therefore, you can see the feasibility of the business.