20504979049 has 2 divisors, whose sum is σ = 20504979050. Its totient is φ = 20504979048.

The previous prime is 20504979023. The next prime is 20504979073. The reversal of 20504979049 is 94097940502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10760327824 + 9744651225 = 103732^2 + 98715^2 .

It is a cyclic number.

It is not a de Polignac number, because 20504979049 - 2⁹ = 20504978537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20504978993 and 20504979011.

It is not a weakly prime, because it can be changed into another prime (20504979149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10252489524 + 10252489525.

It is an arithmetic number, because the mean of its divisors is an integer number (10252489525).

Almost surely, 2^20504979049 is an apocalyptic number.

It is an amenable number.

20504979049 is a deficient number, since it is larger than the sum of its proper divisors (1).

20504979049 is an equidigital number, since it uses as much as digits as its factorization.

20504979049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 49.

The spelling of 20504979049 in words is "twenty billion, five hundred four million, nine hundred seventy-nine thousand, forty-nine".