20408738838 has 16 divisors (see below), whose sum is σ = 41813026416. Its totient is φ = 6636988160.

The previous prime is 20408738827. The next prime is 20408738843. The reversal of 20408738838 is 83883780402.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41480931 + ... + 41481422.

It is an arithmetic number, because the mean of its divisors is an integer number (2613314151).

Almost surely, 2^20408738838 is an apocalyptic number.

20408738838 is an abundant number, since it is smaller than the sum of its proper divisors (21404287578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20408738838 is a wasteful number, since it uses less digits than its factorization.

20408738838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82962399.

The product of its (nonzero) digits is 2064384, while the sum is 51.

The spelling of 20408738838 in words is "twenty billion, four hundred eight million, seven hundred thirty-eight thousand, eight hundred thirty-eight".