20502555055 has 16 divisors (see below), whose sum is σ = 25924589280. Its totient is φ = 15522803712.

The previous prime is 20502555041. The next prime is 20502555061. The reversal of 20502555055 is 55055520502.

It is a cyclic number.

It is not a de Polignac number, because 20502555055 - 2⁵ = 20502555023 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20502555055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17634 + ... + 203263.

It is an arithmetic number, because the mean of its divisors is an integer number (1620286830).

Almost surely, 2^20502555055 is an apocalyptic number.

20502555055 is a deficient number, since it is larger than the sum of its proper divisors (5422034225).

20502555055 is a wasteful number, since it uses less digits than its factorization.

20502555055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221898.

The product of its (nonzero) digits is 62500, while the sum is 34.

The spelling of 20502555055 in words is "twenty billion, five hundred two million, five hundred fifty-five thousand, fifty-five".