18020916 has 36 divisors (see below), whose sum is σ = 45706752. Its totient is φ = 5986704.

The previous prime is 18020909. The next prime is 18020917. The reversal of 18020916 is 61902081.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 18020916.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18020917) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13135 + ... + 14441.

It is an arithmetic number, because the mean of its divisors is an integer number (1269632).

Almost surely, 2^18020916 is an apocalyptic number.

It is an amenable number.

18020916 is an abundant number, since it is smaller than the sum of its proper divisors (27685836).

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

18020916 is a wasteful number, since it uses less digits than its factorization.

18020916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700 (or 1695 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 18020916 is about 4245.1049456992. The cubic root of 18020916 is about 262.1756101780.

Adding to 18020916 its reverse (61902081), we get a palindrome (79922997).

The spelling of 18020916 in words is "eighteen million, twenty thousand, nine hundred sixteen".