Factorization
140 = 2 × 2 × 5 × 7
140 has 12 divisors: 1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140
Sum of all divisors other than 140:
196
Sums & differences
Difference of 2 squares: 140 = 122 - 22 = 362 - 342
Goldbach conjecture: 140 = 137 + 3 = 127 + 13 = 109 + 31 = 103 + 37 = 97 + 43 = 79 + 61 = 73 + 67
