Advent calendar 2019
13 December
Each clue in this crossnumber (except 5A) gives a property of that answer that is true of no other answer. For example: 7A is a multiple of 13; but 1A, 3A, 5A, 1D, 2D, 4D, and 6D are all not multiples of 13.
No number starts with 0.

Across 
1  The only multiple of 3.  (2) 
3  The only number larger than 300.  (3) 
5  Today's number.  (3) 
7  The only multiple of 13.  (2) 
Down 
1  The only square number.  (2) 
2  The only number whose digits have product 4.  (3) 
4  The only number whose digits add to 11.  (3) 
6  The only number less than 20.  (2)  