20443313431 has 4 divisors (see below), whose sum is σ = 20443599792. Its totient is φ = 20443027072.

The previous prime is 20443313381. The next prime is 20443313437. The reversal of 20443313431 is 13431334402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20443313431 - 2⁹ = 20443312919 is a prime.

It is a super-2 number, since 2×20443313431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20443313431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20443313437) 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, 60246 + ... + 210988.

It is an arithmetic number, because the mean of its divisors is an integer number (5110899948).

Almost surely, 2^20443313431 is an apocalyptic number.

20443313431 is a deficient number, since it is larger than the sum of its proper divisors (286361).

20443313431 is a wasteful number, since it uses less digits than its factorization.

20443313431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286360.

The product of its (nonzero) digits is 10368, while the sum is 28.

Adding to 20443313431 its reverse (13431334402), we get a palindrome (33874647833).

The spelling of 20443313431 in words is "twenty billion, four hundred forty-three million, three hundred thirteen thousand, four hundred thirty-one".