18020838 has 16 divisors (see below), whose sum is σ = 39318336. Its totient is φ = 5460840.

The previous prime is 18020837. The next prime is 18020851. The reversal of 18020838 is 83802081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18020831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136456 + ... + 136587.

It is an arithmetic number, because the mean of its divisors is an integer number (2457396).

Almost surely, 2^18020838 is an apocalyptic number.

18020838 is an abundant number, since it is smaller than the sum of its proper divisors (21297498).

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

18020838 is a wasteful number, since it uses less digits than its factorization.

18020838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273059.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 18020838 is about 4245.0957586373. The cubic root of 18020838 is about 262.1752319189.

The spelling of 18020838 in words is "eighteen million, twenty thousand, eight hundred thirty-eight".