20569009049 has 2 divisors, whose sum is σ = 20569009050. Its totient is φ = 20569009048.

The previous prime is 20569009039. The next prime is 20569009061. The reversal of 20569009049 is 94090096502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17432449024 + 3136560025 = 132032^2 + 56005^2 .

It is a cyclic number.

It is not a de Polignac number, because 20569009049 - 2⁸ = 20569008793 is a prime.

It is not a weakly prime, because it can be changed into another prime (20569009039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10284504524 + 10284504525.

It is an arithmetic number, because the mean of its divisors is an integer number (10284504525).

Almost surely, 2^20569009049 is an apocalyptic number.

It is an amenable number.

20569009049 is a deficient number, since it is larger than the sum of its proper divisors (1).

20569009049 is an equidigital number, since it uses as much as digits as its factorization.

20569009049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 44.

The spelling of 20569009049 in words is "twenty billion, five hundred sixty-nine million, nine thousand, forty-nine".