18525720 has 64 divisors (see below), whose sum is σ = 55883520. Its totient is φ = 4913024.

The previous prime is 18525719. The next prime is 18525757. The reversal of 18525720 is 2752581.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31267 + ... + 31853.

It is an arithmetic number, because the mean of its divisors is an integer number (873180).

Almost surely, 2^18525720 is an apocalyptic number.

18525720 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 18525720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27941760).

18525720 is an abundant number, since it is smaller than the sum of its proper divisors (37357800).

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

18525720 is a wasteful number, since it uses less digits than its factorization.

18525720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864 (or 860 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 18525720 is about 4304.1514843230. The cubic root of 18525720 is about 264.6011324680.

The spelling of 18525720 in words is "eighteen million, five hundred twenty-five thousand, seven hundred twenty".