20653336439 has 2 divisors, whose sum is σ = 20653336440. Its totient is φ = 20653336438.

The previous prime is 20653336423. The next prime is 20653336463. The reversal of 20653336439 is 93463335602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20653336439 - 2⁴ = 20653336423 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20653336439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20653336409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10326668219 + 10326668220.

It is an arithmetic number, because the mean of its divisors is an integer number (10326668220).

Almost surely, 2^20653336439 is an apocalyptic number.

20653336439 is a deficient number, since it is larger than the sum of its proper divisors (1).

20653336439 is an equidigital number, since it uses as much as digits as its factorization.

20653336439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1049760, while the sum is 44.

The spelling of 20653336439 in words is "twenty billion, six hundred fifty-three million, three hundred thirty-six thousand, four hundred thirty-nine".