20713785139 has 4 divisors (see below), whose sum is σ = 20907372024. Its totient is φ = 20520198256.

The previous prime is 20713785097. The next prime is 20713785173. The reversal of 20713785139 is 93158731702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20713785139 - 2¹¹ = 20713783091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20713785839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96793282 + ... + 96793495.

It is an arithmetic number, because the mean of its divisors is an integer number (5226843006).

Almost surely, 2^20713785139 is an apocalyptic number.

20713785139 is a deficient number, since it is larger than the sum of its proper divisors (193586885).

20713785139 is a wasteful number, since it uses less digits than its factorization.

20713785139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193586884.

The product of its (nonzero) digits is 317520, while the sum is 46.

The spelling of 20713785139 in words is "twenty billion, seven hundred thirteen million, seven hundred eighty-five thousand, one hundred thirty-nine".