20568149 has 4 divisors (see below), whose sum is σ = 23506464. Its totient is φ = 17629836.

The previous prime is 20568137. The next prime is 20568151. The reversal of 20568149 is 94186502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20568149 - 2²⁴ = 3790933 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 (20568649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1469147 + ... + 1469160.

It is an arithmetic number, because the mean of its divisors is an integer number (5876616).

Almost surely, 2^20568149 is an apocalyptic number.

It is an amenable number.

20568149 is a deficient number, since it is larger than the sum of its proper divisors (2938315).

20568149 is an equidigital number, since it uses as much as digits as its factorization.

20568149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2938314.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 20568149 is about 4535.2121229332. The cubic root of 20568149 is about 273.9881226315.

The spelling of 20568149 in words is "twenty million, five hundred sixty-eight thousand, one hundred forty-nine".