18057720 has 64 divisors (see below), whose sum is σ = 56052000. Its totient is φ = 4648448.

The previous prime is 18057719. The next prime is 18057727. The reversal of 18057720 is 2775081.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18057727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 886 + ... + 6074.

Almost surely, 2^18057720 is an apocalyptic number.

18057720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18057720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28026000).

18057720 is an abundant number, since it is smaller than the sum of its proper divisors (37994280).

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

18057720 is a wasteful number, since it uses less digits than its factorization.

18057720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5232 (or 5228 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 18057720 is about 4249.4376098491. The cubic root of 18057720 is about 262.3539686630.

The spelling of 18057720 in words is "eighteen million, fifty-seven thousand, seven hundred twenty".