20557012323 has 16 divisors (see below), whose sum is σ = 30549121920. Its totient is φ = 12219647616.

The previous prime is 20557012291. The next prime is 20557012331. The reversal of 20557012323 is 32321075502.

It is a happy number.

It is not a de Polignac number, because 20557012323 - 2⁵ = 20557012291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20557010323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10606365 + ... + 10608302.

It is an arithmetic number, because the mean of its divisors is an integer number (1909320120).

Almost surely, 2^20557012323 is an apocalyptic number.

20557012323 is a deficient number, since it is larger than the sum of its proper divisors (9992109597).

20557012323 is a wasteful number, since it uses less digits than its factorization.

20557012323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21214706.

The product of its (nonzero) digits is 12600, while the sum is 30.

Adding to 20557012323 its reverse (32321075502), we get a palindrome (52878087825).

The spelling of 20557012323 in words is "twenty billion, five hundred fifty-seven million, twelve thousand, three hundred twenty-three".