20185390 has 16 divisors (see below), whose sum is σ = 36415008. Its totient is φ = 8056096.

The previous prime is 20185381. The next prime is 20185393. The reversal of 20185390 is 9358102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20185393) 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, 3024 + ... + 7036.

It is an arithmetic number, because the mean of its divisors is an integer number (2275938).

Almost surely, 2^20185390 is an apocalyptic number.

20185390 is a deficient number, since it is larger than the sum of its proper divisors (16229618).

20185390 is a wasteful number, since it uses less digits than its factorization.

20185390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4523.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 20185390 is about 4492.8153756859. The cubic root of 20185390 is about 272.2778932527.

The spelling of 20185390 in words is "twenty million, one hundred eighty-five thousand, three hundred ninety".