18520000 has 70 divisors (see below), whose sum is σ = 46022768. Its totient is φ = 7392000.

The previous prime is 18519997. The next prime is 18520001. The reversal of 18520000 is 2581.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18520001) by changing a digit.

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 9 ways as a sum of consecutive naturals, for example, 39769 + ... + 40231.

Almost surely, 2^18520000 is an apocalyptic number.

18520000 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 18520000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23011384).

18520000 is an abundant number, since it is smaller than the sum of its proper divisors (27502768).

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

18520000 is an frugal number, since it uses more digits than its factorization.

18520000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495 (or 470 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 18520000 is about 4303.4869582700. The cubic root of 18520000 is about 264.5738969224.

Adding to 18520000 its reverse (2581), we get a palindrome (18522581).

The spelling of 18520000 in words is "eighteen million, five hundred twenty thousand".