20512385817 has 16 divisors (see below), whose sum is σ = 34098511872. Its totient is φ = 10655784720.

The previous prime is 20512385797. The next prime is 20512385909. The reversal of 20512385817 is 71858321502.

20512385817 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 20512385817 - 2⁷ = 20512385689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20512385717) 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, 44398873 + ... + 44399334.

It is an arithmetic number, because the mean of its divisors is an integer number (2131156992).

Almost surely, 2^20512385817 is an apocalyptic number.

It is an amenable number.

20512385817 is a deficient number, since it is larger than the sum of its proper divisors (13586126055).

20512385817 is a wasteful number, since it uses less digits than its factorization.

20512385817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88798228.

The product of its (nonzero) digits is 134400, while the sum is 42.

The spelling of 20512385817 in words is "twenty billion, five hundred twelve million, three hundred eighty-five thousand, eight hundred seventeen".