19797924544 has 28 divisors (see below), whose sum is σ = 40994618544. Its totient is φ = 9468571904.

The previous prime is 19797924541. The next prime is 19797924557. The reversal of 19797924544 is 44542979791.

It is not an unprimeable number, because it can be changed into a prime (19797924541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6723367 + ... + 6726310.

Almost surely, 2^19797924544 is an apocalyptic number.

It is an amenable number.

19797924544 is an abundant number, since it is smaller than the sum of its proper divisors (21196694000).

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

19797924544 is a wasteful number, since it uses less digits than its factorization.

19797924544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13449712 (or 13449702 counting only the distinct ones).

The product of its digits is 22861440, while the sum is 61.

The spelling of 19797924544 in words is "nineteen billion, seven hundred ninety-seven million, nine hundred twenty-four thousand, five hundred forty-four".