20657349189 has 16 divisors (see below), whose sum is σ = 30670464640. Its totient is φ = 13741423200.

The previous prime is 20657349161. The next prime is 20657349241. The reversal of 20657349189 is 98194375602.

20657349189 is a `hidden beast` number, since 2 + 0 + 6 + 5 + 73 + 491 + 89 = 666.

It is not a de Polignac number, because 20657349189 - 2²⁵ = 20623794757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20657349389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 824737 + ... + 849414.

It is an arithmetic number, because the mean of its divisors is an integer number (1916904040).

It is a 1-persistent number, because it is pandigital, but 2⋅20657349189 = 41314698378 is not.

Almost surely, 2^20657349189 is an apocalyptic number.

It is an amenable number.

20657349189 is a deficient number, since it is larger than the sum of its proper divisors (10013115451).

20657349189 is a wasteful number, since it uses less digits than its factorization.

20657349189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1674617 (or 1674611 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 20657349189 in words is "twenty billion, six hundred fifty-seven million, three hundred forty-nine thousand, one hundred eighty-nine".