20312020231 has 4 divisors (see below), whose sum is σ = 20320904032. Its totient is φ = 20303136432.

The previous prime is 20312020213. The next prime is 20312020237. The reversal of 20312020231 is 13202021302.

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 20312020231 - 2⁹ = 20312019719 is a prime.

It is a super-2 number, since 2×20312020231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312020237) 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 3 ways as a sum of consecutive naturals, for example, 4438470 + ... + 4443043.

It is an arithmetic number, because the mean of its divisors is an integer number (5080226008).

Almost surely, 2^20312020231 is an apocalyptic number.

20312020231 is a deficient number, since it is larger than the sum of its proper divisors (8883801).

20312020231 is an equidigital number, since it uses as much as digits as its factorization.

20312020231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8883800.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 20312020231 its reverse (13202021302), we get a palindrome (33514041533).

The spelling of 20312020231 in words is "twenty billion, three hundred twelve million, twenty thousand, two hundred thirty-one".