20523139177 has 16 divisors (see below), whose sum is σ = 22735175040. Its totient is φ = 18427191552.

The previous prime is 20523139139. The next prime is 20523139181. The reversal of 20523139177 is 77193132502.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20523139177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20523139277) 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, 78943 + ... + 217435.

It is an arithmetic number, because the mean of its divisors is an integer number (1420948440).

Almost surely, 2^20523139177 is an apocalyptic number.

It is an amenable number.

20523139177 is a deficient number, since it is larger than the sum of its proper divisors (2212035863).

20523139177 is a wasteful number, since it uses less digits than its factorization.

20523139177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138912.

The product of its (nonzero) digits is 79380, while the sum is 40.

The spelling of 20523139177 in words is "twenty billion, five hundred twenty-three million, one hundred thirty-nine thousand, one hundred seventy-seven".