18020208 has 40 divisors (see below), whose sum is σ = 49004800. Its totient is φ = 5690304.

The previous prime is 18020203. The next prime is 18020231. The reversal of 18020208 is 80202081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18020203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8968 + ... + 10791.

It is an arithmetic number, because the mean of its divisors is an integer number (1225120).

Almost surely, 2^18020208 is an apocalyptic number.

It is an amenable number.

18020208 is an abundant number, since it is smaller than the sum of its proper divisors (30984592).

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

18020208 is a wasteful number, since it uses less digits than its factorization.

18020208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19789 (or 19783 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 18020208 is about 4245.0215547156. The cubic root of 18020208 is about 262.1721767091.

Adding to 18020208 its reverse (80202081), we get a palindrome (98222289).

The spelling of 18020208 in words is "eighteen million, twenty thousand, two hundred eight".