Because 26 is greater than the sum of its proper divisors.
1, 2, 3, 6, 13, 26, 39, 78
2,4,8 (1 and 16 are divisors too, but the number and 1 are always divisors)
Sum of divisors = 91.
12 has six divisors.
The divisors of 130 are: 1, 2, 5, 10, 13, 26, 65, 130
Because 26 is greater than the sum of its proper divisors.
2 and 13.
1, 2, 3, 6, 13, 26, 39, 78.
1, 2, 4, 8, 13, 26, 52, 104.
1, 2, 3, 6, 13, 26, 39, 78
1, 2, 5, 10, 13, 25, 26, 50, 65, 130, 325, 650.
Divisors are used to divide numbers.
2,4,8 (1 and 16 are divisors too, but the number and 1 are always divisors)
Sum of divisors: 1728.
Sum of divisors: 980.
Sum of divisors = 91.