20889538864 has 20 divisors (see below), whose sum is σ = 40477723000. Its totient is φ = 10443674880.

The previous prime is 20889538849. The next prime is 20889538889. The reversal of 20889538864 is 46883598802.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101887 + ... + 228385.

It is an arithmetic number, because the mean of its divisors is an integer number (2023886150).

Almost surely, 2^20889538864 is an apocalyptic number.

It is an amenable number.

20889538864 is a deficient number, since it is larger than the sum of its proper divisors (19588184136).

20889538864 is a wasteful number, since it uses less digits than its factorization.

20889538864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136828 (or 136822 counting only the distinct ones).

The product of its (nonzero) digits is 26542080, while the sum is 61.

The spelling of 20889538864 in words is "twenty billion, eight hundred eighty-nine million, five hundred thirty-eight thousand, eight hundred sixty-four".