19947818752 has 36 divisors (see below), whose sum is σ = 40228258336. Its totient is φ = 9871073280.

The previous prime is 19947818749. The next prime is 19947818771. The reversal of 19947818752 is 25781874991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 376824 + ... + 426487.

Almost surely, 2^19947818752 is an apocalyptic number.

It is an amenable number.

19947818752 is an abundant number, since it is smaller than the sum of its proper divisors (20280439584).

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

19947818752 is an frugal number, since it uses more digits than its factorization.

19947818752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803424 (or 803410 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 61.

The spelling of 19947818752 in words is "nineteen billion, nine hundred forty-seven million, eight hundred eighteen thousand, seven hundred fifty-two".