20323312550 has 24 divisors (see below), whose sum is σ = 38723349672. Its totient is φ = 7931048000.

The previous prime is 20323312523. The next prime is 20323312553. The reversal of 20323312550 is 5521332302.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20323312553) 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, 4954856 + ... + 4958955.

It is an arithmetic number, because the mean of its divisors is an integer number (1613472903).

Almost surely, 2^20323312550 is an apocalyptic number.

20323312550 is a deficient number, since it is larger than the sum of its proper divisors (18400037122).

20323312550 is a wasteful number, since it uses less digits than its factorization.

20323312550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9913864 (or 9913859 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 26.

Adding to 20323312550 its reverse (5521332302), we get a palindrome (25844644852).

The spelling of 20323312550 in words is "twenty billion, three hundred twenty-three million, three hundred twelve thousand, five hundred fifty".