Question

The sum of all positive divisors of $450$ is

• A. 1209
• B. 1299
• C. 1199
• D. 1099

Answer 1

Answer: (A)

$450=2^1\times 5^2\times 3^2$
Sum of positive divisor
$=(1+2)(1+5+5^2)(1+3+3^2)$
$=(3)(31)(13)=1209$