19794814536 has 64 divisors (see below), whose sum is σ = 59533286400. Its totient is φ = 5357994048.

The previous prime is 19794814513. The next prime is 19794814561. The reversal of 19794814536 is 63541849791.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3097500 + ... + 3103883.

It is an arithmetic number, because the mean of its divisors is an integer number (930207600).

Almost surely, 2^19794814536 is an apocalyptic number.

It is an amenable number.

19794814536 is an abundant number, since it is smaller than the sum of its proper divisors (39738471864).

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

19794814536 is a wasteful number, since it uses less digits than its factorization.

19794814536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6201418 (or 6201414 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 57.

The spelling of 19794814536 in words is "nineteen billion, seven hundred ninety-four million, eight hundred fourteen thousand, five hundred thirty-six".