20859064563 has 8 divisors (see below), whose sum is σ = 27845719488. Its totient is φ = 13889226344.

The previous prime is 20859064559. The next prime is 20859064609. The reversal of 20859064563 is 36546095802.

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 20859064563 - 2² = 20859064559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20859064663) 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, 4201281 + ... + 4206242.

It is an arithmetic number, because the mean of its divisors is an integer number (3480714936).

Almost surely, 2^20859064563 is an apocalyptic number.

20859064563 is a deficient number, since it is larger than the sum of its proper divisors (6986654925).

20859064563 is an equidigital number, since it uses as much as digits as its factorization.

20859064563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8408353.

The product of its (nonzero) digits is 1555200, while the sum is 48.

The spelling of 20859064563 in words is "twenty billion, eight hundred fifty-nine million, sixty-four thousand, five hundred sixty-three".