What's this and how to keep them away from my house

They get into the house during the night and they usually died overnight. I found between 15 to 20 every day.

Have you had a lot of rain or flooding in your area? They are millipedes - not normally a major issue - they tend to live on decaying green material but if it's been very wet they are probably looking for a drier area. Just sweep them up and throw them out for the birds and hedgehogs to enjoy