20774321689 has 9 divisors (see below), whose sum is σ = 22836327829. Its totient is φ = 18884305660.

The previous prime is 20774321683. The next prime is 20774321731. The reversal of 20774321689 is 98612347702.

It is a happy number.

The square root of 20774321689 is 144133.

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

It is not a de Polignac number, because 20774321689 - 2²³ = 20765933081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20774321683) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1578912 + ... + 1592014.

Almost surely, 2^20774321689 is an apocalyptic number.

20774321689 is the 144133-rd square number.

20774321689 is the 72067-th centered octagonal number.

It is an amenable number.

20774321689 is a deficient number, since it is larger than the sum of its proper divisors (2062006140).

20774321689 is an frugal number, since it uses more digits than its factorization.

20774321689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26228 (or 13114 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 49.

Multiplying 20774321689 by its sum of digits (49), we get a square (1017941762761 = 1008931²).

The spelling of 20774321689 in words is "twenty billion, seven hundred seventy-four million, three hundred twenty-one thousand, six hundred eighty-nine".