20889776161 has 8 divisors (see below), whose sum is σ = 21645043200. Its totient is φ = 20136837840.

The previous prime is 20889776153. The next prime is 20889776189. The reversal of 20889776161 is 16167798802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20889776161 - 2³ = 20889776153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20889776111) 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 7 ways as a sum of consecutive naturals, for example, 563905 + ... + 599806.

It is an arithmetic number, because the mean of its divisors is an integer number (2705630400).

Almost surely, 2^20889776161 is an apocalyptic number.

It is an amenable number.

20889776161 is a deficient number, since it is larger than the sum of its proper divisors (755267039).

20889776161 is a wasteful number, since it uses less digits than its factorization.

20889776161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164359.

The product of its (nonzero) digits is 2032128, while the sum is 55.

The spelling of 20889776161 in words is "twenty billion, eight hundred eighty-nine million, seven hundred seventy-six thousand, one hundred sixty-one".