20185218 has 24 divisors (see below), whose sum is σ = 45243900. Its totient is φ = 6496224.

The previous prime is 20185213. The next prime is 20185241. The reversal of 20185218 is 81258102.

It can be written as a sum of positive squares in 2 ways, for example, as 19474569 + 710649 = 4413^2 + 843^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20185191 and 20185200.

It is not an unprimeable number, because it can be changed into a prime (20185213) 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, 18813 + ... + 19856.

Almost surely, 2^20185218 is an apocalyptic number.

20185218 is an abundant number, since it is smaller than the sum of its proper divisors (25058682).

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

20185218 is a wasteful number, since it uses less digits than its factorization.

20185218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38706 (or 38703 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 20185218 is about 4492.7962339728. The cubic root of 20185218 is about 272.2771198892.

The spelling of 20185218 in words is "twenty million, one hundred eighty-five thousand, two hundred eighteen".