20185349 has 4 divisors (see below), whose sum is σ = 20212236. Its totient is φ = 20158464.

The previous prime is 20185339. The next prime is 20185357. The reversal of 20185349 is 94358102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94358102 = 2 ⋅47179051.

It can be written as a sum of positive squares in 2 ways, for example, as 6160324 + 14025025 = 2482^2 + 3745^2 .

It is a cyclic number.

It is not a de Polignac number, because 20185349 - 2⁸ = 20185093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20185339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12284 + ... + 13829.

It is an arithmetic number, because the mean of its divisors is an integer number (5053059).

Almost surely, 2^20185349 is an apocalyptic number.

It is an amenable number.

20185349 is a deficient number, since it is larger than the sum of its proper divisors (26887).

20185349 is an equidigital number, since it uses as much as digits as its factorization.

20185349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26886.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 20185349 is about 4492.8108128431. The cubic root of 20185349 is about 272.2777089048.

The spelling of 20185349 in words is "twenty million, one hundred eighty-five thousand, three hundred forty-nine".