18066720 has 192 divisors, whose sum is σ = 68705280. Its totient is φ = 3898368.

The previous prime is 18066709. The next prime is 18066721. The reversal of 18066720 is 2766081.

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 (18066721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63699 + ... + 63981.

It is an arithmetic number, because the mean of its divisors is an integer number (357840).

Almost surely, 2^18066720 is an apocalyptic number.

18066720 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 18066720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34352640).

18066720 is an abundant number, since it is smaller than the sum of its proper divisors (50638560).

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

18066720 is a wasteful number, since it uses less digits than its factorization.

18066720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327 (or 319 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 18066720 is about 4250.4964415936. The cubic root of 18066720 is about 262.3975473199.

The spelling of 18066720 in words is "eighteen million, sixty-six thousand, seven hundred twenty".