20431971159 has 8 divisors (see below), whose sum is σ = 27256062960. Its totient is φ = 13614596736.

The previous prime is 20431971143. The next prime is 20431971173. The reversal of 20431971159 is 95117913402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20431971159 - 2⁴ = 20431971143 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20431971159.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431971139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1672242 + ... + 1684415.

It is an arithmetic number, because the mean of its divisors is an integer number (3407007870).

Almost surely, 2^20431971159 is an apocalyptic number.

20431971159 is a deficient number, since it is larger than the sum of its proper divisors (6824091801).

20431971159 is a wasteful number, since it uses less digits than its factorization.

20431971159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3358689.

The product of its (nonzero) digits is 68040, while the sum is 42.

The spelling of 20431971159 in words is "twenty billion, four hundred thirty-one million, nine hundred seventy-one thousand, one hundred fifty-nine".