20504860609 has 4 divisors (see below), whose sum is σ = 20550528900. Its totient is φ = 20459192320.

The previous prime is 20504860603. The next prime is 20504860613. The reversal of 20504860609 is 90606840502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6213853584 + 14291007025 = 78828^2 + 119545^2 .

It is a cyclic number.

It is not a de Polignac number, because 20504860609 - 2²⁹ = 19967989697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20504860603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22833472 + ... + 22834369.

It is an arithmetic number, because the mean of its divisors is an integer number (5137632225).

Almost surely, 2^20504860609 is an apocalyptic number.

It is an amenable number.

20504860609 is a deficient number, since it is larger than the sum of its proper divisors (45668291).

20504860609 is an equidigital number, since it uses as much as digits as its factorization.

20504860609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45668290.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 20504860609 in words is "twenty billion, five hundred four million, eight hundred sixty thousand, six hundred nine".