20993585185 has 8 divisors (see below), whose sum is σ = 25267058856. Its totient is φ = 16745030400.

The previous prime is 20993585177. The next prime is 20993585233. The reversal of 20993585185 is 58158539902.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1117096929 + 19876488256 = 33423^2 + 140984^2 .

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

It is not a de Polignac number, because 20993585185 - 2³ = 20993585177 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6227866 + ... + 6231235.

It is an arithmetic number, because the mean of its divisors is an integer number (3158382357).

Almost surely, 2^20993585185 is an apocalyptic number.

It is an amenable number.

20993585185 is a deficient number, since it is larger than the sum of its proper divisors (4273473671).

20993585185 is a wasteful number, since it uses less digits than its factorization.

20993585185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12459443.

The product of its (nonzero) digits is 3888000, while the sum is 55.

The spelling of 20993585185 in words is "twenty billion, nine hundred ninety-three million, five hundred eighty-five thousand, one hundred eighty-five".