20005111506550 has 12 divisors (see below), whose sum is σ = 37209507402276. Its totient is φ = 8002044602600.

The previous prime is 20005111506493. The next prime is 20005111506553. The reversal of 20005111506550 is 5560511150002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20005111506553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 200051115016 + ... + 200051115115.

It is an arithmetic number, because the mean of its divisors is an integer number (3100792283523).

Almost surely, 2^{20005111506550} is an apocalyptic number.

20005111506550 is a deficient number, since it is larger than the sum of its proper divisors (17204395895726).

20005111506550 is a wasteful number, since it uses less digits than its factorization.

20005111506550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400102230143 (or 400102230138 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 31.

Adding to 20005111506550 its reverse (5560511150002), we get a palindrome (25565622656552).

The spelling of 20005111506550 in words is "twenty trillion, five billion, one hundred eleven million, five hundred six thousand, five hundred fifty".