20812967289 has 27 divisors (see below), whose sum is σ = 31741265829. Its totient is φ = 13139838360.

The previous prime is 20812967257. The next prime is 20812967297. The reversal of 20812967289 is 98276921802.

The square root of 20812967289 is 144267.

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

20812967289 is a `hidden beast` number, since 208 + 1 + 296 + 72 + 89 = 666.

It is not a de Polignac number, because 20812967289 - 2⁵ = 20812967257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20812967389) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 8221954 + ... + 8224484.

Almost surely, 2^20812967289 is an apocalyptic number.

20812967289 is the 144267-th square number.

20812967289 is the 72134-th centered octagonal number.

It is an amenable number.

20812967289 is a deficient number, since it is larger than the sum of its proper divisors (10928298540).

20812967289 is an frugal number, since it uses more digits than its factorization.

20812967289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5106 (or 2553 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The spelling of 20812967289 in words is "twenty billion, eight hundred twelve million, nine hundred sixty-seven thousand, two hundred eighty-nine".