20518535535 has 32 divisors (see below), whose sum is σ = 34143909888. Its totient is φ = 10513480320.

The previous prime is 20518535519. The next prime is 20518535573. The reversal of 20518535535 is 53553581502.

It is not a de Polignac number, because 20518535535 - 2⁴ = 20518535519 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 221407 + ... + 300096.

It is an arithmetic number, because the mean of its divisors is an integer number (1066997184).

Almost surely, 2^20518535535 is an apocalyptic number.

20518535535 is a deficient number, since it is larger than the sum of its proper divisors (13625374353).

20518535535 is a wasteful number, since it uses less digits than its factorization.

20518535535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521615.

The product of its (nonzero) digits is 450000, while the sum is 42.

The spelling of 20518535535 in words is "twenty billion, five hundred eighteen million, five hundred thirty-five thousand, five hundred thirty-five".