20854586455 has 4 divisors (see below), whose sum is σ = 25025503752. Its totient is φ = 16683669160.

The previous prime is 20854586449. The next prime is 20854586471. The reversal of 20854586455 is 55468545802.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20854586455 - 2⁹ = 20854585943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2085458641 + ... + 2085458650.

It is an arithmetic number, because the mean of its divisors is an integer number (6256375938).

Almost surely, 2^20854586455 is an apocalyptic number.

20854586455 is a deficient number, since it is larger than the sum of its proper divisors (4170917297).

20854586455 is an equidigital number, since it uses as much as digits as its factorization.

20854586455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4170917296.

The product of its (nonzero) digits is 7680000, while the sum is 52.

The spelling of 20854586455 in words is "twenty billion, eight hundred fifty-four million, five hundred eighty-six thousand, four hundred fifty-five".