20131312443 has 32 divisors (see below), whose sum is σ = 29626394112. Its totient is φ = 12158447840.

The previous prime is 20131312429. The next prime is 20131312447. The reversal of 20131312443 is 34421313102.

It is a happy number.

It is not a de Polignac number, because 20131312443 - 2⁹ = 20131311931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20131312447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1161346 + ... + 1178552.

It is an arithmetic number, because the mean of its divisors is an integer number (925824816).

Almost surely, 2^20131312443 is an apocalyptic number.

20131312443 is a deficient number, since it is larger than the sum of its proper divisors (9495081669).

20131312443 is a wasteful number, since it uses less digits than its factorization.

20131312443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17536 (or 17514 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 20131312443 its reverse (34421313102), we get a palindrome (54552625545).

The spelling of 20131312443 in words is "twenty billion, one hundred thirty-one million, three hundred twelve thousand, four hundred forty-three".