There are: 4000/20 = 200 of them
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There are approximately 15 twenties in 300. 400 will have 20 twenties.
The answer depends on 4000 WHAT!
There are 50 twenties in one thousand
I'm thinking that's not what you wanted to ask but as written, the answer is 4000.
1,461,000 days are in 4000 years