2040

2040 = 2 x 2 x 2 x 3 x 5 x 17.

2040 is a number that can be expressed as the difference of the squares of primes in exactly four distinct ways (A092000).

2040 is the sum of a twin prime pair (A054735): 2040 = 1019 + 1021.

2040 is the number of ways of writing 13 as a sum of six squares (A000141).

2040 is the sum of 12 consecutive primes (A127339): 2040 = 139 + 149 + 151 + 157 + 163 + 167 + 173 + 179 + 181 + 191 + 193 + 197.

Source: On-Line Encyclopedia of Integer Sequences