20684647577 has 8 divisors (see below), whose sum is σ = 22585766112. Its totient is φ = 18786978400.

The previous prime is 20684647553. The next prime is 20684647579. The reversal of 20684647577 is 77574648602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20684647577 - 2¹² = 20684643481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20684647579) 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 in 7 ways as a sum of consecutive naturals, for example, 849788 + ... + 873789.

It is an arithmetic number, because the mean of its divisors is an integer number (2823220764).

Almost surely, 2^20684647577 is an apocalyptic number.

It is an amenable number.

20684647577 is a deficient number, since it is larger than the sum of its proper divisors (1901118535).

20684647577 is a wasteful number, since it uses less digits than its factorization.

20684647577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1724679.

The product of its (nonzero) digits is 15805440, while the sum is 56.

The spelling of 20684647577 in words is "twenty billion, six hundred eighty-four million, six hundred forty-seven thousand, five hundred seventy-seven".