20312443443 has 16 divisors (see below), whose sum is σ = 27279714816. Its totient is φ = 13443513600.

The previous prime is 20312443433. The next prime is 20312443471. The reversal of 20312443443 is 34434421302.

It is a happy number.

It is not a de Polignac number, because 20312443443 - 2⁴ = 20312443427 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20312443443.

It is not an unprimeable number, because it can be changed into a prime (20312443433) 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 15 ways as a sum of consecutive naturals, for example, 755530 + ... + 781952.

It is an arithmetic number, because the mean of its divisors is an integer number (1704982176).

Almost surely, 2^20312443443 is an apocalyptic number.

20312443443 is a deficient number, since it is larger than the sum of its proper divisors (6967271373).

20312443443 is a wasteful number, since it uses less digits than its factorization.

20312443443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28274.

The product of its (nonzero) digits is 27648, while the sum is 30.

Adding to 20312443443 its reverse (34434421302), we get a palindrome (54746864745).

The spelling of 20312443443 in words is "twenty billion, three hundred twelve million, four hundred forty-three thousand, four hundred forty-three".