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First solution in Clear category for Numbers Factory by Hashmore
def checkio(number):
ans=''
for i in range(9,1,-1):
while divmod(number,i)[1]==0:
ans=str(i)+ans
number//=i
return int(ans) if number==1 else 0
if __name__ == '__main__':
#These "asserts" using only for self-checking and not necessary for auto-testing
assert checkio(20) == 45, "1st example"
assert checkio(21) == 37, "2nd example"
assert checkio(17) == 0, "3rd example"
assert checkio(33) == 0, "4th example"
assert checkio(3125) == 55555, "5th example"
assert checkio(9973) == 0, "6th example"
Dec. 15, 2017
