20553555139 has 8 divisors (see below), whose sum is σ = 22229599392. Its totient is φ = 18891082560.

The previous prime is 20553555133. The next prime is 20553555157. The reversal of 20553555139 is 93155535502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20553555139 - 2⁵ = 20553555107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20553555095 and 20553555104.

It is not an unprimeable number, because it can be changed into a prime (20553555133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3389767 + ... + 3395824.

It is an arithmetic number, because the mean of its divisors is an integer number (2778699924).

Almost surely, 2^20553555139 is an apocalyptic number.

20553555139 is a deficient number, since it is larger than the sum of its proper divisors (1676044253).

20553555139 is a wasteful number, since it uses less digits than its factorization.

20553555139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6785837.

The product of its (nonzero) digits is 506250, while the sum is 43.

The spelling of 20553555139 in words is "twenty billion, five hundred fifty-three million, five hundred fifty-five thousand, one hundred thirty-nine".