20896976789 has 4 divisors (see below), whose sum is σ = 22504436556. Its totient is φ = 19289517024.

The previous prime is 20896976767. The next prime is 20896976813. The reversal of 20896976789 is 98767969802.

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 9248091889 + 11648884900 = 96167^2 + 107930^2 .

It is a cyclic number.

It is not a de Polignac number, because 20896976789 - 2¹⁶ = 20896911253 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 (20896976689) 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, 803729864 + ... + 803729889.

It is an arithmetic number, because the mean of its divisors is an integer number (5626109139).

Almost surely, 2^20896976789 is an apocalyptic number.

It is an amenable number.

20896976789 is a deficient number, since it is larger than the sum of its proper divisors (1607459767).

20896976789 is a wasteful number, since it uses less digits than its factorization.

20896976789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1607459766.

The product of its (nonzero) digits is 164602368, while the sum is 71.

The spelling of 20896976789 in words is "twenty billion, eight hundred ninety-six million, nine hundred seventy-six thousand, seven hundred eighty-nine".