20034728857 has 32 divisors (see below), whose sum is σ = 23891898240. Its totient is φ = 16560529920.

The previous prime is 20034728849. The next prime is 20034728881. The reversal of 20034728857 is 75882743002.

It is not a de Polignac number, because 20034728857 - 2³ = 20034728849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20034728897) 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, 3522538 + ... + 3528220.

It is an arithmetic number, because the mean of its divisors is an integer number (746621820).

Almost surely, 2^20034728857 is an apocalyptic number.

It is an amenable number.

20034728857 is a deficient number, since it is larger than the sum of its proper divisors (3857169383).

20034728857 is a wasteful number, since it uses less digits than its factorization.

20034728857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6073.

The product of its (nonzero) digits is 752640, while the sum is 46.

The spelling of 20034728857 in words is "twenty billion, thirty-four million, seven hundred twenty-eight thousand, eight hundred fifty-seven".