20858660055 has 32 divisors (see below), whose sum is σ = 37093075200. Its totient is φ = 11121314976.

The previous prime is 20858660021. The next prime is 20858660057. The reversal of 20858660055 is 55006685802.

20858660055 is a `hidden beast` number, since 2 + 0 + 8 + 586 + 60 + 0 + 5 + 5 = 666.

It is not a de Polignac number, because 20858660055 - 2²³ = 20850271447 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20858660057) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 472852 + ... + 515078.

It is an arithmetic number, because the mean of its divisors is an integer number (1159158600).

Almost surely, 2^20858660055 is an apocalyptic number.

20858660055 is a deficient number, since it is larger than the sum of its proper divisors (16234415145).

20858660055 is a wasteful number, since it uses less digits than its factorization.

20858660055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45900 (or 45894 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 45.

The spelling of 20858660055 in words is "twenty billion, eight hundred fifty-eight million, six hundred sixty thousand, fifty-five".