20312131303 has 4 divisors (see below), whose sum is σ = 20312478288. Its totient is φ = 20311784320.

The previous prime is 20312131261. The next prime is 20312131339. The reversal of 20312131303 is 30313121302.

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-20312131303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312131363) 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, 61651 + ... + 210772.

It is an arithmetic number, because the mean of its divisors is an integer number (5078119572).

Almost surely, 2^20312131303 is an apocalyptic number.

20312131303 is a deficient number, since it is larger than the sum of its proper divisors (346985).

20312131303 is an equidigital number, since it uses as much as digits as its factorization.

20312131303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346984.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 20312131303 its reverse (30313121302), we get a palindrome (50625252605).

The spelling of 20312131303 in words is "twenty billion, three hundred twelve million, one hundred thirty-one thousand, three hundred three".