20380839987 has 16 divisors (see below), whose sum is σ = 27556058880. Its totient is φ = 13397069472.

The previous prime is 20380839979. The next prime is 20380840009. The reversal of 20380839987 is 78993808302.

It is not a de Polignac number, because 20380839987 - 2³ = 20380839979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20380839967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46338 + ... + 207144.

It is an arithmetic number, because the mean of its divisors is an integer number (1722253680).

Almost surely, 2^20380839987 is an apocalyptic number.

20380839987 is a deficient number, since it is larger than the sum of its proper divisors (7175218893).

20380839987 is a wasteful number, since it uses less digits than its factorization.

20380839987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161402.

The product of its (nonzero) digits is 5225472, while the sum is 57.

The spelling of 20380839987 in words is "twenty billion, three hundred eighty million, eight hundred thirty-nine thousand, nine hundred eighty-seven".