20618468255 has 32 divisors (see below), whose sum is σ = 31135726080. Its totient is φ = 12732923520.

The previous prime is 20618468219. The next prime is 20618468261. The reversal of 20618468255 is 55286481602.

It is not a de Polignac number, because 20618468255 - 2²⁰ = 20617419679 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 209060 + ... + 291449.

It is an arithmetic number, because the mean of its divisors is an integer number (972991440).

Almost surely, 2^20618468255 is an apocalyptic number.

20618468255 is a deficient number, since it is larger than the sum of its proper divisors (10517257825).

20618468255 is a wasteful number, since it uses less digits than its factorization.

20618468255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500639.

The product of its (nonzero) digits is 921600, while the sum is 47.

The spelling of 20618468255 in words is "twenty billion, six hundred eighteen million, four hundred sixty-eight thousand, two hundred fifty-five".