19996673 has 4 divisors (see below), whose sum is σ = 20029908. Its totient is φ = 19963440.

The previous prime is 19996663. The next prime is 19996733. The reversal of 19996673 is 37669991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37669991 = 31 ⋅1215161.

It can be written as a sum of positive squares in 2 ways, for example, as 4092529 + 15904144 = 2023^2 + 3988^2 .

It is a cyclic number.

It is not a de Polignac number, because 19996673 - 2²⁴ = 3219457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19996663) 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, 15698 + ... + 16923.

It is an arithmetic number, because the mean of its divisors is an integer number (5007477).

It is a Proth number, since it is equal to 2441 ⋅ 2¹³ + 1 and 2441 < 2¹³.

Almost surely, 2^19996673 is an apocalyptic number.

It is an amenable number.

19996673 is a deficient number, since it is larger than the sum of its proper divisors (33235).

19996673 is an equidigital number, since it uses as much as digits as its factorization.

19996673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33234.

The product of its digits is 551124, while the sum is 50.

The square root of 19996673 is about 4471.7639696209. The cubic root of 19996673 is about 271.4267093791.

The spelling of 19996673 in words is "nineteen million, nine hundred ninety-six thousand, six hundred seventy-three".