20439442097 has 2 divisors, whose sum is σ = 20439442098. Its totient is φ = 20439442096.

The previous prime is 20439442027. The next prime is 20439442099. The reversal of 20439442097 is 79024493402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17265697201 + 3173744896 = 131399^2 + 56336^2 .

It is a cyclic number.

It is not a de Polignac number, because 20439442097 - 2¹² = 20439438001 is a prime.

Together with 20439442099, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20439442099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10219721048 + 10219721049.

It is an arithmetic number, because the mean of its divisors is an integer number (10219721049).

Almost surely, 2^20439442097 is an apocalyptic number.

It is an amenable number.

20439442097 is a deficient number, since it is larger than the sum of its proper divisors (1).

20439442097 is an equidigital number, since it uses as much as digits as its factorization.

20439442097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 44.

The spelling of 20439442097 in words is "twenty billion, four hundred thirty-nine million, four hundred forty-two thousand, ninety-seven".