19730813693 has 4 divisors (see below), whose sum is σ = 19739361180. Its totient is φ = 19722266208.

The previous prime is 19730813681. The next prime is 19730813699. The reversal of 19730813693 is 39631803791.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12683714884 + 7047098809 = 112622^2 + 83947^2 .

It is a cyclic number.

It is not a de Polignac number, because 19730813693 - 2⁴ = 19730813677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19730813699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4270280 + ... + 4274897.

It is an arithmetic number, because the mean of its divisors is an integer number (4934840295).

Almost surely, 2^19730813693 is an apocalyptic number.

It is an amenable number.

19730813693 is a deficient number, since it is larger than the sum of its proper divisors (8547487).

19730813693 is an equidigital number, since it uses as much as digits as its factorization.

19730813693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8547486.

The product of its (nonzero) digits is 734832, while the sum is 50.

The spelling of 19730813693 in words is "nineteen billion, seven hundred thirty million, eight hundred thirteen thousand, six hundred ninety-three".