20312012571 has 4 divisors (see below), whose sum is σ = 27082683432. Its totient is φ = 13541341712.

The previous prime is 20312012549. The next prime is 20312012579. The reversal of 20312012571 is 17521021302.

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

It is a cyclic number.

It is not a de Polignac number, because 20312012571 - 2⁷ = 20312012443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20312012579) 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, 3385335426 + ... + 3385335431.

It is an arithmetic number, because the mean of its divisors is an integer number (6770670858).

Almost surely, 2^20312012571 is an apocalyptic number.

20312012571 is a deficient number, since it is larger than the sum of its proper divisors (6770670861).

20312012571 is an equidigital number, since it uses as much as digits as its factorization.

20312012571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6770670860.

The product of its (nonzero) digits is 840, while the sum is 24.

Adding to 20312012571 its reverse (17521021302), we get a palindrome (37833033873).

The spelling of 20312012571 in words is "twenty billion, three hundred twelve million, twelve thousand, five hundred seventy-one".