20893975805 has 8 divisors (see below), whose sum is σ = 25123020000. Its totient is φ = 16681681296.

The previous prime is 20893975763. The next prime is 20893975829. The reversal of 20893975805 is 50857939802.

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 20893975805 - 2³² = 16599008509 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4184675 + ... + 4189664.

It is an arithmetic number, because the mean of its divisors is an integer number (3140377500).

Almost surely, 2^20893975805 is an apocalyptic number.

It is an amenable number.

20893975805 is a deficient number, since it is larger than the sum of its proper divisors (4229044195).

20893975805 is an equidigital number, since it uses as much as digits as its factorization.

20893975805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8374843.

The product of its (nonzero) digits is 5443200, while the sum is 56.

The spelling of 20893975805 in words is "twenty billion, eight hundred ninety-three million, nine hundred seventy-five thousand, eight hundred five".