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Project euler problem 20


This problem is very simple one liner in python.

n! means n × (n − 1) × … × 3 × 2 × 1

For example, 10! = 10 × 9 × … × 3 × 2 × 1 = 3628800,
and the sum of the digits in the number 10! is 3 + 6 + 2 + 8 + 8 + 0 + 0 = 27.

Find the sum of the digits in the number 100!

import math
print sum([int(x) for x in  str(math.factorial(100))])

Answer: 648

real 0m0.164s
user 0m0.031s
sys 0m0.108s

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