20045205555 has 16 divisors (see below), whose sum is σ = 32074083744. Its totient is φ = 10690191360.

The previous prime is 20045205539. The next prime is 20045205559. The reversal of 20045205555 is 55550254002.

It is not a de Polignac number, because 20045205555 - 2⁴ = 20045205539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20045205559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 522945 + ... + 559965.

It is an arithmetic number, because the mean of its divisors is an integer number (2004630234).

Almost surely, 2^20045205555 is an apocalyptic number.

20045205555 is a deficient number, since it is larger than the sum of its proper divisors (12028878189).

20045205555 is a wasteful number, since it uses less digits than its factorization.

20045205555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73126.

The product of its (nonzero) digits is 50000, while the sum is 33.

Adding to 20045205555 its reverse (55550254002), we get a palindrome (75595459557).

The spelling of 20045205555 in words is "twenty billion, forty-five million, two hundred five thousand, five hundred fifty-five".