20880889921 has 8 divisors (see below), whose sum is σ = 21243124224. Its totient is φ = 20521290480.

The previous prime is 20880889907. The next prime is 20880889927. The reversal of 20880889921 is 12998808802.

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 20880889921 - 2¹⁹ = 20880365633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20880889927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 642726 + ... + 674431.

It is an arithmetic number, because the mean of its divisors is an integer number (2655390528).

Almost surely, 2^20880889921 is an apocalyptic number.

It is an amenable number.

20880889921 is a deficient number, since it is larger than the sum of its proper divisors (362234303).

20880889921 is a wasteful number, since it uses less digits than its factorization.

20880889921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1317431.

The product of its (nonzero) digits is 1327104, while the sum is 55.

The spelling of 20880889921 in words is "twenty billion, eight hundred eighty million, eight hundred eighty-nine thousand, nine hundred twenty-one".