20313311231 has 4 divisors (see below), whose sum is σ = 20313744000. Its totient is φ = 20312878464.

The previous prime is 20313311191. The next prime is 20313311233. The reversal of 20313311231 is 13211331302.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20313311231 is a prime.

It is a super-2 number, since 2×20313311231² (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 (20313311233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136031 + ... + 243168.

It is an arithmetic number, because the mean of its divisors is an integer number (5078436000).

Almost surely, 2^20313311231 is an apocalyptic number.

20313311231 is a deficient number, since it is larger than the sum of its proper divisors (432769).

20313311231 is an equidigital number, since it uses as much as digits as its factorization.

20313311231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432768.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 20313311231 its reverse (13211331302), we get a palindrome (33524642533).

The spelling of 20313311231 in words is "twenty billion, three hundred thirteen million, three hundred eleven thousand, two hundred thirty-one".