20005440239 has 2 divisors, whose sum is σ = 20005440240. Its totient is φ = 20005440238.

The previous prime is 20005440197. The next prime is 20005440253. The reversal of 20005440239 is 93204450002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20005440239 - 2⁸ = 20005439983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20005442239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10002720119 + 10002720120.

It is an arithmetic number, because the mean of its divisors is an integer number (10002720120).

Almost surely, 2^20005440239 is an apocalyptic number.

20005440239 is a deficient number, since it is larger than the sum of its proper divisors (1).

20005440239 is an equidigital number, since it uses as much as digits as its factorization.

20005440239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 29.

The spelling of 20005440239 in words is "twenty billion, five million, four hundred forty thousand, two hundred thirty-nine".