18020835 has 48 divisors (see below), whose sum is σ = 37589760. Its totient is φ = 7801920.

The previous prime is 18020831. The next prime is 18020837. The reversal of 18020835 is 53802081.

It is a happy number.

It is not a de Polignac number, because 18020835 - 2² = 18020831 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18020799 and 18020808.

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 47 ways as a sum of consecutive naturals, for example, 4480 + ... + 7490.

It is an arithmetic number, because the mean of its divisors is an integer number (783120).

Almost surely, 2^18020835 is an apocalyptic number.

18020835 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18020835 is an abundant number, since it is smaller than the sum of its proper divisors (19568925).

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

18020835 is a wasteful number, since it uses less digits than its factorization.

18020835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3048 (or 3045 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 18020835 is about 4245.0954052883. The cubic root of 18020835 is about 262.1752173705.

The spelling of 18020835 in words is "eighteen million, twenty thousand, eight hundred thirty-five".