20587170055 has 4 divisors (see below), whose sum is σ = 24704604072. Its totient is φ = 16469736040.

The previous prime is 20587170053. The next prime is 20587170061. The reversal of 20587170055 is 55007178502.

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

It is not a de Polignac number, because 20587170055 - 2¹ = 20587170053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20587170053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2058717001 + ... + 2058717010.

It is an arithmetic number, because the mean of its divisors is an integer number (6176151018).

Almost surely, 2^20587170055 is an apocalyptic number.

20587170055 is a deficient number, since it is larger than the sum of its proper divisors (4117434017).

20587170055 is an equidigital number, since it uses as much as digits as its factorization.

20587170055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4117434016.

The product of its (nonzero) digits is 98000, while the sum is 40.

The spelling of 20587170055 in words is "twenty billion, five hundred eighty-seven million, one hundred seventy thousand, fifty-five".