20340120439 has 2 divisors, whose sum is σ = 20340120440. Its totient is φ = 20340120438.

The previous prime is 20340120433. The next prime is 20340120457. The reversal of 20340120439 is 93402104302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20340120439 - 2²⁷ = 20205902711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20340120433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10170060219 + 10170060220.

It is an arithmetic number, because the mean of its divisors is an integer number (10170060220).

Almost surely, 2^20340120439 is an apocalyptic number.

20340120439 is a deficient number, since it is larger than the sum of its proper divisors (1).

20340120439 is an equidigital number, since it uses as much as digits as its factorization.

20340120439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 28.

The spelling of 20340120439 in words is "twenty billion, three hundred forty million, one hundred twenty thousand, four hundred thirty-nine".