19936081640 has 32 divisors (see below), whose sum is σ = 45275410080. Its totient is φ = 7899903552.

The previous prime is 19936081631. The next prime is 19936081643. The reversal of 19936081640 is 4618063991.

It is not an unprimeable number, because it can be changed into a prime (19936081643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2324702 + ... + 2333261.

It is an arithmetic number, because the mean of its divisors is an integer number (1414856565).

Almost surely, 2^19936081640 is an apocalyptic number.

19936081640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19936081640 is an abundant number, since it is smaller than the sum of its proper divisors (25339328440).

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

19936081640 is a wasteful number, since it uses less digits than its factorization.

19936081640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4658081 (or 4658077 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 47.

The spelling of 19936081640 in words is "nineteen billion, nine hundred thirty-six million, eighty-one thousand, six hundred forty".