19920517938 has 48 divisors (see below), whose sum is σ = 43293968640. Its totient is φ = 6619773888.

The previous prime is 19920517927. The next prime is 19920517957. The reversal of 19920517938 is 83971502991.

19920517938 is a `hidden beast` number, since 1 + 9 + 92 + 0 + 517 + 9 + 38 = 666.

It is a Curzon 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 23 ways as a sum of consecutive naturals, for example, 15011031 + ... + 15012357.

It is an arithmetic number, because the mean of its divisors is an integer number (901957680).

Almost surely, 2^19920517938 is an apocalyptic number.

19920517938 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19920517938 is an abundant number, since it is smaller than the sum of its proper divisors (23373450702).

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

19920517938 is a wasteful number, since it uses less digits than its factorization.

19920517938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3271 (or 3268 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 54.

The spelling of 19920517938 in words is "nineteen billion, nine hundred twenty million, five hundred seventeen thousand, nine hundred thirty-eight".