20683485389 has 4 divisors (see below), whose sum is σ = 23638269024. Its totient is φ = 17728701756.

The previous prime is 20683485359. The next prime is 20683485397. The reversal of 20683485389 is 98358438602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20683485389 - 2¹² = 20683481293 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20683485359) 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 3 ways as a sum of consecutive naturals, for example, 1477391807 + ... + 1477391820.

It is an arithmetic number, because the mean of its divisors is an integer number (5909567256).

Almost surely, 2^20683485389 is an apocalyptic number.

It is an amenable number.

20683485389 is a deficient number, since it is larger than the sum of its proper divisors (2954783635).

20683485389 is an equidigital number, since it uses as much as digits as its factorization.

20683485389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2954783634.

The product of its (nonzero) digits is 9953280, while the sum is 56.

The spelling of 20683485389 in words is "twenty billion, six hundred eighty-three million, four hundred eighty-five thousand, three hundred eighty-nine".