20205185 has 48 divisors (see below), whose sum is σ = 32890368. Its totient is φ = 11594880.

The previous prime is 20205139. The next prime is 20205193. The reversal of 20205185 is 58150202.

It is not a de Polignac number, because 20205185 - 2⁶ = 20205121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20205185.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 54872 + ... + 55238.

It is an arithmetic number, because the mean of its divisors is an integer number (685216).

Almost surely, 2^20205185 is an apocalyptic number.

It is an amenable number.

20205185 is a deficient number, since it is larger than the sum of its proper divisors (12685183).

20205185 is a wasteful number, since it uses less digits than its factorization.

20205185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414 (or 403 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 20205185 is about 4495.0177975176. The cubic root of 20205185 is about 272.3668681667.

Adding to 20205185 its reverse (58150202), we get a palindrome (78355387).

The spelling of 20205185 in words is "twenty million, two hundred five thousand, one hundred eighty-five".