20172310427 has 2 divisors, whose sum is σ = 20172310428. Its totient is φ = 20172310426.

The previous prime is 20172310363. The next prime is 20172310429. The reversal of 20172310427 is 72401327102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20172310427 - 2⁶ = 20172310363 is a prime.

Together with 20172310429, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20172310427.

It is not a weakly prime, because it can be changed into another prime (20172310429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10086155213 + 10086155214.

It is an arithmetic number, because the mean of its divisors is an integer number (10086155214).

Almost surely, 2^20172310427 is an apocalyptic number.

20172310427 is a deficient number, since it is larger than the sum of its proper divisors (1).

20172310427 is an equidigital number, since it uses as much as digits as its factorization.

20172310427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 29.

Adding to 20172310427 its reverse (72401327102), we get a palindrome (92573637529).

The spelling of 20172310427 in words is "twenty billion, one hundred seventy-two million, three hundred ten thousand, four hundred twenty-seven".