1580

1580 = 2 x 2 x 5 x 79.

1580 is a divisor of 23¹² - 1.

1580 is a number n such that 1 + n + n³ + n⁵ + n⁷ + n⁹ + n¹¹ + n¹³ + n¹⁵ + n¹⁷ + n¹⁹ + n²¹ + n²³ is prime (A124181).

1580 is the number of regions in a 20-sided regular polygon that are four-sided polygons (4-gons) (A067151).

1580 is the number of partitions of 33² into distinct squares (A030273).

Source: On-Line Encyclopedia of Integer Sequences