20205109049 has 2 divisors, whose sum is σ = 20205109050. Its totient is φ = 20205109048.

The previous prime is 20205109037. The next prime is 20205109063. The reversal of 20205109049 is 94090150202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11907174400 + 8297934649 = 109120^2 + 91093^2 .

It is a cyclic number.

It is not a de Polignac number, because 20205109049 - 2²⁰ = 20204060473 is a prime.

It is not a weakly prime, because it can be changed into another prime (20205109009) 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, 10102554524 + 10102554525.

It is an arithmetic number, because the mean of its divisors is an integer number (10102554525).

Almost surely, 2^20205109049 is an apocalyptic number.

It is an amenable number.

20205109049 is a deficient number, since it is larger than the sum of its proper divisors (1).

20205109049 is an equidigital number, since it uses as much as digits as its factorization.

20205109049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 32.

The spelling of 20205109049 in words is "twenty billion, two hundred five million, one hundred nine thousand, forty-nine".