20047557129 has 32 divisors (see below), whose sum is σ = 27312021504. Its totient is φ = 13078195200.

The previous prime is 20047557083. The next prime is 20047557133. The reversal of 20047557129 is 92175574002.

It is a de Polignac number, because none of the positive numbers 2^k-20047557129 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20047557149) 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 31 ways as a sum of consecutive naturals, for example, 9353832 + ... + 9355974.

It is an arithmetic number, because the mean of its divisors is an integer number (853500672).

Almost surely, 2^20047557129 is an apocalyptic number.

It is an amenable number.

20047557129 is a deficient number, since it is larger than the sum of its proper divisors (7264464375).

20047557129 is a wasteful number, since it uses less digits than its factorization.

20047557129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2597.

The product of its (nonzero) digits is 176400, while the sum is 42.

The spelling of 20047557129 in words is "twenty billion, forty-seven million, five hundred fifty-seven thousand, one hundred twenty-nine".