20573638563 has 8 divisors (see below), whose sum is σ = 27552362688. Its totient is φ = 13655336744.

The previous prime is 20573638549. The next prime is 20573638567. The reversal of 20573638563 is 36583637502.

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 20573638563 - 2⁵ = 20573638531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20573638567) 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, 15104781 + ... + 15106142.

It is an arithmetic number, because the mean of its divisors is an integer number (3444045336).

Almost surely, 2^20573638563 is an apocalyptic number.

20573638563 is a deficient number, since it is larger than the sum of its proper divisors (6978724125).

20573638563 is a wasteful number, since it uses less digits than its factorization.

20573638563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30211153.

The product of its (nonzero) digits is 2721600, while the sum is 48.

The spelling of 20573638563 in words is "twenty billion, five hundred seventy-three million, six hundred thirty-eight thousand, five hundred sixty-three".