18668720 has 160 divisors (see below), whose sum is σ = 54960768. Its totient is φ = 5750784.

The previous prime is 18668701. The next prime is 18668753. The reversal of 18668720 is 2786681.

It is a super-2 number, since 2×18668720² = 697042212876800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 352214 + ... + 352266.

Almost surely, 2^18668720 is an apocalyptic number.

18668720 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 18668720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27480384).

18668720 is an abundant number, since it is smaller than the sum of its proper divisors (36292048).

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

18668720 is a wasteful number, since it uses less digits than its factorization.

18668720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 18668720 is about 4320.7314195631. The cubic root of 18668720 is about 265.2802067541.

The spelling of 18668720 in words is "eighteen million, six hundred sixty-eight thousand, seven hundred twenty".