19707896872 has 8 divisors (see below), whose sum is σ = 36952306650. Its totient is φ = 9853948432.

The previous prime is 19707896861. The next prime is 19707896893. The reversal of 19707896872 is 27869870791.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12129497956 + 7578398916 = 110134^2 + 87054^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1231743547 + ... + 1231743562.

Almost surely, 2^19707896872 is an apocalyptic number.

It is an amenable number.

19707896872 is a deficient number, since it is larger than the sum of its proper divisors (17244409778).

19707896872 is a wasteful number, since it uses less digits than its factorization.

19707896872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2463487115 (or 2463487111 counting only the distinct ones).

The product of its (nonzero) digits is 21337344, while the sum is 64.

The spelling of 19707896872 in words is "nineteen billion, seven hundred seven million, eight hundred ninety-six thousand, eight hundred seventy-two".