20577596509 has 4 divisors (see below), whose sum is σ = 21133747804. Its totient is φ = 20021445216.

The previous prime is 20577596491. The next prime is 20577596521. The reversal of 20577596509 is 90569577502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10747468900 + 9830127609 = 103670^2 + 99147^2 .

It is a cyclic number.

It is not a de Polignac number, because 20577596509 - 2¹⁷ = 20577465437 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20577596509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20577596579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278075592 + ... + 278075665.

It is an arithmetic number, because the mean of its divisors is an integer number (5283436951).

Almost surely, 2^20577596509 is an apocalyptic number.

It is an amenable number.

20577596509 is a deficient number, since it is larger than the sum of its proper divisors (556151295).

20577596509 is an equidigital number, since it uses as much as digits as its factorization.

20577596509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556151294.

The product of its (nonzero) digits is 5953500, while the sum is 55.

The spelling of 20577596509 in words is "twenty billion, five hundred seventy-seven million, five hundred ninety-six thousand, five hundred nine".