18117620 has 24 divisors (see below), whose sum is σ = 38933664. Its totient is φ = 7078176.

The previous prime is 18117611. The next prime is 18117647. The reversal of 18117620 is 2671181.

It is a self number, because there is not a number n which added to its sum of digits gives 18117620.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9674 + ... + 11393.

It is an arithmetic number, because the mean of its divisors is an integer number (1622236).

Almost surely, 2^18117620 is an apocalyptic number.

18117620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18117620 is an abundant number, since it is smaller than the sum of its proper divisors (20816044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18117620 is a wasteful number, since it uses less digits than its factorization.

18117620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21119 (or 21117 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 18117620 is about 4256.4797661918. The cubic root of 18117620 is about 262.6437368505.

The spelling of 18117620 in words is "eighteen million, one hundred seventeen thousand, six hundred twenty".