20577174209 has 2 divisors, whose sum is σ = 20577174210. Its totient is φ = 20577174208.

The previous prime is 20577174193. The next prime is 20577174271. The reversal of 20577174209 is 90247177502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19250175025 + 1326999184 = 138745^2 + 36428^2 .

It is a cyclic number.

It is not a de Polignac number, because 20577174209 - 2⁴ = 20577174193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20577174209.

It is not a weakly prime, because it can be changed into another prime (20577174109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10288587104 + 10288587105.

It is an arithmetic number, because the mean of its divisors is an integer number (10288587105).

Almost surely, 2^20577174209 is an apocalyptic number.

It is an amenable number.

20577174209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20577174209 is an equidigital number, since it uses as much as digits as its factorization.

20577174209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 246960, while the sum is 44.

The spelling of 20577174209 in words is "twenty billion, five hundred seventy-seven million, one hundred seventy-four thousand, two hundred nine".