20889788089 has 9 divisors (see below), whose sum is σ = 22050015717. Its totient is φ = 19787723964.

The previous prime is 20889788047. The next prime is 20889788099. The reversal of 20889788089 is 98088798802.

The square root of 20889788089 is 144533.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 20889788089 - 2¹⁷ = 20889657017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20889788039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2742324 + ... + 2749930.

Almost surely, 2^20889788089 is an apocalyptic number.

20889788089 is the 144533-rd square number.

20889788089 is the 72267-th centered octagonal number.

It is an amenable number.

20889788089 is a deficient number, since it is larger than the sum of its proper divisors (1160227628).

20889788089 is an frugal number, since it uses more digits than its factorization.

20889788089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15252 (or 7626 counting only the distinct ones).

The product of its (nonzero) digits is 37158912, while the sum is 67.

The spelling of 20889788089 in words is "twenty billion, eight hundred eighty-nine million, seven hundred eighty-eight thousand, eighty-nine".