19794801636 has 81 divisors (see below), whose sum is σ = 50704995523. Its totient is φ = 6511318320.

The previous prime is 19794801617. The next prime is 19794801703. The reversal of 19794801636 is 63610849791.

The square root of 19794801636 is 140694.

It is a perfect power (a square), and thus also a powerful number.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 110585395 + ... + 110585573.

Almost surely, 2^19794801636 is an apocalyptic number.

19794801636 is the 140694-th square number.

It is an amenable number.

19794801636 is an abundant number, since it is smaller than the sum of its proper divisors (30910193887).

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

19794801636 is a wasteful number, since it uses less digits than its factorization.

19794801636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630 (or 315 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The spelling of 19794801636 in words is "nineteen billion, seven hundred ninety-four million, eight hundred one thousand, six hundred thirty-six".