18445720 has 16 divisors (see below), whose sum is σ = 41502960. Its totient is φ = 7378272.

The previous prime is 18445709. The next prime is 18445723. The reversal of 18445720 is 2754481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18445723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230532 + ... + 230611.

It is an arithmetic number, because the mean of its divisors is an integer number (2593935).

Almost surely, 2^18445720 is an apocalyptic number.

18445720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18445720 is an abundant number, since it is smaller than the sum of its proper divisors (23057240).

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

18445720 is a wasteful number, since it uses less digits than its factorization.

18445720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461154 (or 461150 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 18445720 is about 4294.8480764749. The cubic root of 18445720 is about 264.2197053834.

The spelling of 18445720 in words is "eighteen million, four hundred forty-five thousand, seven hundred twenty".