20312471057 has 4 divisors (see below), whose sum is σ = 20424694836. Its totient is φ = 20200247280.

The previous prime is 20312471051. The next prime is 20312471077. The reversal of 20312471057 is 75017421302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9201413776 + 11111057281 = 95924^2 + 105409^2 .

It is a cyclic number.

It is not a de Polignac number, because 20312471057 - 2¹² = 20312466961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20312471051) 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 3 ways as a sum of consecutive naturals, for example, 56111618 + ... + 56111979.

It is an arithmetic number, because the mean of its divisors is an integer number (5106173709).

Almost surely, 2^20312471057 is an apocalyptic number.

It is an amenable number.

20312471057 is a deficient number, since it is larger than the sum of its proper divisors (112223779).

20312471057 is a wasteful number, since it uses less digits than its factorization.

20312471057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112223778.

The product of its (nonzero) digits is 11760, while the sum is 32.

Adding to 20312471057 its reverse (75017421302), we get a palindrome (95329892359).

The spelling of 20312471057 in words is "twenty billion, three hundred twelve million, four hundred seventy-one thousand, fifty-seven".