20113568609 has 4 divisors (see below), whose sum is σ = 20988071616. Its totient is φ = 19239065604.

The previous prime is 20113568603. The next prime is 20113568621. The reversal of 20113568609 is 90686531102.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90686531102 = 2 ⋅45343265551.

It is a cyclic number.

It is not a de Polignac number, because 20113568609 - 2⁸ = 20113568353 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20113568603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 437251469 + ... + 437251514.

It is an arithmetic number, because the mean of its divisors is an integer number (5247017904).

Almost surely, 2^20113568609 is an apocalyptic number.

It is an amenable number.

20113568609 is a deficient number, since it is larger than the sum of its proper divisors (874503007).

20113568609 is an equidigital number, since it uses as much as digits as its factorization.

20113568609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874503006.

The product of its (nonzero) digits is 77760, while the sum is 41.

The spelling of 20113568609 in words is "twenty billion, one hundred thirteen million, five hundred sixty-eight thousand, six hundred nine".