20051322550 has 24 divisors (see below), whose sum is σ = 42623383536. Its totient is φ = 6874739040.

The previous prime is 20051322521. The next prime is 20051322553. The reversal of 20051322550 is 5522315002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20051322553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28644397 + ... + 28645096.

It is an arithmetic number, because the mean of its divisors is an integer number (1775974314).

Almost surely, 2^20051322550 is an apocalyptic number.

20051322550 is an abundant number, since it is smaller than the sum of its proper divisors (22572060986).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20051322550 is a wasteful number, since it uses less digits than its factorization.

20051322550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57289512 (or 57289507 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

Adding to 20051322550 its reverse (5522315002), we get a palindrome (25573637552).

The spelling of 20051322550 in words is "twenty billion, fifty-one million, three hundred twenty-two thousand, five hundred fifty".