Question

Find the number of divisors of $1040$

Answer 1

$1040=2\times 2\times 2\times 2\times 5\times 13=2^4\times 5^1\times {13}^1$

$\therefore d\left(1040\right)=(4+1)(1+1)(1+1)=5\times 2\times 2=20$