20938716529 has 16 divisors (see below), whose sum is σ = 21656613888. Its totient is φ = 20233193472.

The previous prime is 20938716521. The next prime is 20938716569. The reversal of 20938716529 is 92561783902.

It is a cyclic number.

It is not a de Polignac number, because 20938716529 - 2³ = 20938716521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20938716521) 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, 1968744 + ... + 1979350.

It is an arithmetic number, because the mean of its divisors is an integer number (1353538368).

Almost surely, 2^20938716529 is an apocalyptic number.

It is an amenable number.

20938716529 is a deficient number, since it is larger than the sum of its proper divisors (717897359).

20938716529 is a wasteful number, since it uses less digits than its factorization.

20938716529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11184.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 20938716529 in words is "twenty billion, nine hundred thirty-eight million, seven hundred sixteen thousand, five hundred twenty-nine".