20943838385 has 8 divisors (see below), whose sum is σ = 25133844456. Its totient is φ = 16754245120.

The previous prime is 20943838373. The next prime is 20943838417. The reversal of 20943838385 is 58383834902.

It can be written as a sum of positive squares in 4 ways, for example, as 8338611856 + 12605226529 = 91316^2 + 112273^2 .

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

It is not a de Polignac number, because 20943838385 - 2²⁸ = 20675402929 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22295 + ... + 205875.

It is an arithmetic number, because the mean of its divisors is an integer number (3141730557).

Almost surely, 2^20943838385 is an apocalyptic number.

It is an amenable number.

20943838385 is a deficient number, since it is larger than the sum of its proper divisors (4190006071).

20943838385 is a wasteful number, since it uses less digits than its factorization.

20943838385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206403.

The product of its (nonzero) digits is 4976640, while the sum is 53.

The spelling of 20943838385 in words is "twenty billion, nine hundred forty-three million, eight hundred thirty-eight thousand, three hundred eighty-five".