19974104893 has 4 divisors (see below), whose sum is σ = 20018591100. Its totient is φ = 19929618688.

The previous prime is 19974104869. The next prime is 19974104929. The reversal of 19974104893 is 39840147991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39840147991 = 7 ⋅5691449713.

It can be written as a sum of positive squares in 2 ways, for example, as 7882243524 + 12091861369 = 88782^2 + 109963^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19974104893 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 (19974104693) 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, 22242430 + ... + 22243327.

It is an arithmetic number, because the mean of its divisors is an integer number (5004647775).

Almost surely, 2^19974104893 is an apocalyptic number.

It is an amenable number.

19974104893 is a deficient number, since it is larger than the sum of its proper divisors (44486207).

19974104893 is an equidigital number, since it uses as much as digits as its factorization.

19974104893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44486206.

The product of its (nonzero) digits is 1959552, while the sum is 55.

The spelling of 19974104893 in words is "nineteen billion, nine hundred seventy-four million, one hundred four thousand, eight hundred ninety-three".