20927688589 has 4 divisors (see below), whose sum is σ = 21438120060. Its totient is φ = 20417257120.

The previous prime is 20927688583. The next prime is 20927688601. The reversal of 20927688589 is 98588672902.

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 2201955625 + 18725732964 = 46925^2 + 136842^2 .

It is a cyclic number.

It is not a de Polignac number, because 20927688589 - 2³ = 20927688581 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20927688589.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20927688581) 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, 255215674 + ... + 255215755.

It is an arithmetic number, because the mean of its divisors is an integer number (5359530015).

Almost surely, 2^20927688589 is an apocalyptic number.

It is an amenable number.

20927688589 is a deficient number, since it is larger than the sum of its proper divisors (510431471).

20927688589 is an equidigital number, since it uses as much as digits as its factorization.

20927688589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510431470.

The product of its (nonzero) digits is 34836480, while the sum is 64.

The spelling of 20927688589 in words is "twenty billion, nine hundred twenty-seven million, six hundred eighty-eight thousand, five hundred eighty-nine".