20504524639 has 2 divisors, whose sum is σ = 20504524640. Its totient is φ = 20504524638.

The previous prime is 20504524571. The next prime is 20504524657. The reversal of 20504524639 is 93642540502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20504524639 - 2¹³ = 20504516447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20504524669) 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, 10252262319 + 10252262320.

It is an arithmetic number, because the mean of its divisors is an integer number (10252262320).

Almost surely, 2^20504524639 is an apocalyptic number.

20504524639 is a deficient number, since it is larger than the sum of its proper divisors (1).

20504524639 is an equidigital number, since it uses as much as digits as its factorization.

20504524639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 20504524639 in words is "twenty billion, five hundred four million, five hundred twenty-four thousand, six hundred thirty-nine".