20431252443 has 32 divisors (see below), whose sum is σ = 33162200064. Its totient is φ = 10922406912.

The previous prime is 20431252433. The next prime is 20431252459. The reversal of 20431252443 is 34425213402.

It is not a de Polignac number, because 20431252443 - 2⁵ = 20431252411 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20431252443.

It is not an unprimeable number, because it can be changed into a prime (20431252403) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 111730 + ... + 230967.

It is an arithmetic number, because the mean of its divisors is an integer number (1036318752).

Almost surely, 2^20431252443 is an apocalyptic number.

20431252443 is a deficient number, since it is larger than the sum of its proper divisors (12730947621).

20431252443 is a wasteful number, since it uses less digits than its factorization.

20431252443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342891.

The product of its (nonzero) digits is 23040, while the sum is 30.

Adding to 20431252443 its reverse (34425213402), we get a palindrome (54856465845).

The spelling of 20431252443 in words is "twenty billion, four hundred thirty-one million, two hundred fifty-two thousand, four hundred forty-three".