18020185 has 4 divisors (see below), whose sum is σ = 21624228. Its totient is φ = 14416144.

The previous prime is 18020183. The next prime is 18020203. The reversal of 18020185 is 58102081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58102081 = 2797 ⋅20773.

It can be written as a sum of positive squares in 2 ways, for example, as 6110784 + 11909401 = 2472^2 + 3451^2 .

It is a cyclic number.

It is not a de Polignac number, because 18020185 - 2¹ = 18020183 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18020183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1802014 + ... + 1802023.

It is an arithmetic number, because the mean of its divisors is an integer number (5406057).

Almost surely, 2^18020185 is an apocalyptic number.

It is an amenable number.

18020185 is a deficient number, since it is larger than the sum of its proper divisors (3604043).

18020185 is an equidigital number, since it uses as much as digits as its factorization.

18020185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3604042.

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 18020185 is about 4245.0188456590. The cubic root of 18020185 is about 262.1720651684.

The spelling of 18020185 in words is "eighteen million, twenty thousand, one hundred eighty-five".