19807975940 has 24 divisors (see below), whose sum is σ = 41607464640. Its totient is φ = 7921149408.

The previous prime is 19807975939. The next prime is 19807975961. The reversal of 19807975940 is 4957970891.

It is a self number, because there is not a number n which added to its sum of digits gives 19807975940.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46730 + ... + 204449.

It is an arithmetic number, because the mean of its divisors is an integer number (1733644360).

Almost surely, 2^19807975940 is an apocalyptic number.

19807975940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19807975940 is an abundant number, since it is smaller than the sum of its proper divisors (21799488700).

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

19807975940 is a wasteful number, since it uses less digits than its factorization.

19807975940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255131 (or 255129 counting only the distinct ones).

The product of its (nonzero) digits is 5715360, while the sum is 59.

The spelling of 19807975940 in words is "nineteen billion, eight hundred seven million, nine hundred seventy-five thousand, nine hundred forty".