18954720 has 72 divisors (see below), whose sum is σ = 64687896. Its totient is φ = 5054208.

The previous prime is 18954697. The next prime is 18954721. The reversal of 18954720 is 2745981.

18954720 is a `hidden beast` number, since 189 + 5 + 472 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18954721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5142 + ... + 8021.

It is an arithmetic number, because the mean of its divisors is an integer number (898443).

Almost surely, 2^18954720 is an apocalyptic number.

18954720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18954720 is an abundant number, since it is smaller than the sum of its proper divisors (45733176).

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

18954720 is a wasteful number, since it uses less digits than its factorization.

18954720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13184 (or 13173 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 18954720 is about 4353.7018731190. The cubic root of 18954720 is about 266.6280221778.

The spelling of 18954720 in words is "eighteen million, nine hundred fifty-four thousand, seven hundred twenty".