20431164257 has 8 divisors (see below), whose sum is σ = 23357097216. Its totient is φ = 17507030112.

The previous prime is 20431164253. The next prime is 20431164289. The reversal of 20431164257 is 75246113402.

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

It is a cyclic number.

It is not a de Polignac number, because 20431164257 - 2² = 20431164253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20431164251) 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, 425273 + ... + 470870.

It is an arithmetic number, because the mean of its divisors is an integer number (2919637152).

Almost surely, 2^20431164257 is an apocalyptic number.

It is an amenable number.

20431164257 is a deficient number, since it is larger than the sum of its proper divisors (2925932959).

20431164257 is an equidigital number, since it uses as much as digits as its factorization.

20431164257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899407.

The product of its (nonzero) digits is 40320, while the sum is 35.

Adding to 20431164257 its reverse (75246113402), we get a palindrome (95677277659).

The spelling of 20431164257 in words is "twenty billion, four hundred thirty-one million, one hundred sixty-four thousand, two hundred fifty-seven".