生成一组由20个数字组成的随机密码。
A possible solution in Python:

```
import random

password = ''.join(random.choices('0123456789', k=20))
print(password)
```

This code generates a random password consisting of 20 digits using the `random.choices` function from the Python standard library. The `k` parameter specifies the length of the resulting string, and the choices parameter specifies the set of possible characters to choose from (in this case, just the digits 0 through 9). The resulting string is concatenated using the `join()` method with an empty string as the delimiter. Finally, the password is printed to the console.