18868720 has 40 divisors (see below), whose sum is σ = 47246976. Its totient is φ = 6966528.

The previous prime is 18868711. The next prime is 18868721. The reversal of 18868720 is 2786881.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18868721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8032 + ... + 10111.

Almost surely, 2^18868720 is an apocalyptic number.

18868720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18868720 is an abundant number, since it is smaller than the sum of its proper divisors (28378256).

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

18868720 is a wasteful number, since it uses less digits than its factorization.

18868720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18169 (or 18163 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 18868720 is about 4343.8139923344. The cubic root of 18868720 is about 266.2241689180.

The spelling of 18868720 in words is "eighteen million, eight hundred sixty-eight thousand, seven hundred twenty".