7.1. Provide an example of a natural number that is a multiple of 2020, such that the sum of its digits is also a multiple of 2020.
Solution: For example, the number 20202020...2020, where the fragment 2020 repeats 505 times, fits. Such a number is obviously divisible by 2020, and the sum of its digits is $505 \times 4=2020$.

Criteria: Any correct answer with or without verification - 7 points.

Correctly conceived example, but with a calculation error (for example, 2020 repeats 500 times) - 3 points.