20431742043 has 32 divisors (see below), whose sum is σ = 29826220032. Its totient is φ = 12385152000.

The previous prime is 20431742039. The next prime is 20431742057. The reversal of 20431742043 is 34024713402.

It is not a de Polignac number, because 20431742043 - 2² = 20431742039 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20431742043.

It is not an unprimeable number, because it can be changed into a prime (20431742063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 939430 + ... + 960932.

It is an arithmetic number, because the mean of its divisors is an integer number (932069376).

Almost surely, 2^20431742043 is an apocalyptic number.

20431742043 is a deficient number, since it is larger than the sum of its proper divisors (9394477989).

20431742043 is a wasteful number, since it uses less digits than its factorization.

20431742043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22155.

The product of its (nonzero) digits is 16128, while the sum is 30.

The spelling of 20431742043 in words is "twenty billion, four hundred thirty-one million, seven hundred forty-two thousand, forty-three".