20388353856 has 56 divisors (see below), whose sum is σ = 58093746144. Its totient is φ = 6273338880.

The previous prime is 20388353801. The next prime is 20388353893. The reversal of 20388353856 is 65835388302.

It is a junction number, because it is equal to n+sod(n) for n = 20388353799 and 20388353808.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4081710 + ... + 4086701.

It is an arithmetic number, because the mean of its divisors is an integer number (1037388324).

Almost surely, 2^20388353856 is an apocalyptic number.

20388353856 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20388353856 is an abundant number, since it is smaller than the sum of its proper divisors (37705392288).

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

20388353856 is a wasteful number, since it uses less digits than its factorization.

20388353856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8168439 (or 8168429 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 51.

The spelling of 20388353856 in words is "twenty billion, three hundred eighty-eight million, three hundred fifty-three thousand, eight hundred fifty-six".