20384868489 has 4 divisors (see below), whose sum is σ = 27179824656. Its totient is φ = 13589912324.

The previous prime is 20384868403. The next prime is 20384868583. The reversal of 20384868489 is 98486848302.

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 20384868489 - 2⁸ = 20384868233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20384868289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3397478079 + ... + 3397478084.

It is an arithmetic number, because the mean of its divisors is an integer number (6794956164).

Almost surely, 2^20384868489 is an apocalyptic number.

It is an amenable number.

20384868489 is a deficient number, since it is larger than the sum of its proper divisors (6794956167).

20384868489 is an equidigital number, since it uses as much as digits as its factorization.

20384868489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6794956166.

The product of its (nonzero) digits is 21233664, while the sum is 60.

The spelling of 20384868489 in words is "twenty billion, three hundred eighty-four million, eight hundred sixty-eight thousand, four hundred eighty-nine".