18804720 has 160 divisors (see below), whose sum is σ = 67495680. Its totient is φ = 4280320.

The previous prime is 18804719. The next prime is 18804739. The reversal of 18804720 is 2740881.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 44671 + ... + 45089.

It is an arithmetic number, because the mean of its divisors is an integer number (421848).

Almost surely, 2^18804720 is an apocalyptic number.

18804720 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 18804720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33747840).

18804720 is an abundant number, since it is smaller than the sum of its proper divisors (48690960).

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

18804720 is a wasteful number, since it uses less digits than its factorization.

18804720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 18804720 is about 4336.4409369897. The cubic root of 18804720 is about 265.9228298575.

The spelling of 18804720 in words is "eighteen million, eight hundred four thousand, seven hundred twenty".