From a given natural integer, returns the list of divisors in ascending order
    :param n: Natural integer
    :return: List of divisors of n in ascending order

def divisors(n):
    """
    From a given natural integer, returns the list of divisors in ascending order
    :param n: Natural integer
    :return: List of divisors of n in ascending order
    """
    factors = _factor_generator(n)
    _divisors = []
    listexponents = [[k**x for x in range(0, factors[k]+1)] for k in list(factors.keys())]
    listfactors = _cartesian_product(listexponents)
    for f in listfactors:
        _divisors.append(reduce(lambda x, y: x*y, f, 1))
    _divisors.sort()
    return _divisors