18080820 has 60 divisors (see below), whose sum is σ = 56725284. Its totient is φ = 4821120.

The previous prime is 18080807. The next prime is 18080831. The reversal of 18080820 is 2808081.

It can be written as a sum of positive squares in 2 ways, for example, as 2683044 + 15397776 = 1638^2 + 3924^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3961 + ... + 7200.

Almost surely, 2^18080820 is an apocalyptic number.

18080820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18080820 is an abundant number, since it is smaller than the sum of its proper divisors (38644464).

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

18080820 is a wasteful number, since it uses less digits than its factorization.

18080820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11182 (or 11171 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

The square root of 18080820 is about 4252.1547478896. The cubic root of 18080820 is about 262.4657914606.

The spelling of 18080820 in words is "eighteen million, eighty thousand, eight hundred twenty".