20309838989 has 6 divisors (see below), whose sum is σ = 22324038030. Its totient is φ = 18463489880.

The previous prime is 20309838947. The next prime is 20309839013. The reversal of 20309838989 is 98983890302.

It can be written as a sum of positive squares in only one way, i.e., 20104404100 + 205434889 = 141790^2 + 14333^2 .

It is not a de Polignac number, because 20309838989 - 2¹⁶ = 20309773453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20300838989) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 83924834 + ... + 83925075.

It is an arithmetic number, because the mean of its divisors is an integer number (3720673005).

Almost surely, 2^20309838989 is an apocalyptic number.

It is an amenable number.

20309838989 is a deficient number, since it is larger than the sum of its proper divisors (2014199041).

20309838989 is a wasteful number, since it uses less digits than its factorization.

20309838989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167849931 (or 167849920 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 59.

The spelling of 20309838989 in words is "twenty billion, three hundred nine million, eight hundred thirty-eight thousand, nine hundred eighty-nine".