18205616 has 80 divisors (see below), whose sum is σ = 42393120. Its totient is φ = 7464960.

The previous prime is 18205601. The next prime is 18205619. The reversal of 18205616 is 61650281.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18205619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166970 + ... + 167078.

It is an arithmetic number, because the mean of its divisors is an integer number (529914).

Almost surely, 2^18205616 is an apocalyptic number.

18205616 is a gapful number since it is divisible by the number (16) 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 18205616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21196560).

18205616 is an abundant number, since it is smaller than the sum of its proper divisors (24187504).

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

18205616 is a wasteful number, since it uses less digits than its factorization.

18205616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 18205616 is about 4266.8039561245. The cubic root of 18205616 is about 263.0682643136.

Adding to 18205616 its reverse (61650281), we get a palindrome (79855897).

The spelling of 18205616 in words is "eighteen million, two hundred five thousand, six hundred sixteen".