18894720 has 128 divisors (see below), whose sum is σ = 64945440. Its totient is φ = 4644864.

The previous prime is 18894713. The next prime is 18894739. The reversal of 18894720 is 2749881.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24582 + ... + 25338.

Almost surely, 2^18894720 is an apocalyptic number.

18894720 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 18894720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32472720).

18894720 is an abundant number, since it is smaller than the sum of its proper divisors (46050720).

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

18894720 is a wasteful number, since it uses less digits than its factorization.

18894720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792 (or 780 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 18894720 is about 4346.8057237470. The cubic root of 18894720 is about 266.3463932754.

The spelling of 18894720 in words is "eighteen million, eight hundred ninety-four thousand, seven hundred twenty".