19994671 has 4 divisors (see below), whose sum is σ = 20023200. Its totient is φ = 19966144.

The previous prime is 19994657. The next prime is 19994701. The reversal of 19994671 is 17649991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17649991 = 1511 ⋅11681.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19994671 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 (19994371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13186 + ... + 14623.

It is an arithmetic number, because the mean of its divisors is an integer number (5005800).

Almost surely, 2^19994671 is an apocalyptic number.

19994671 is a deficient number, since it is larger than the sum of its proper divisors (28529).

19994671 is an equidigital number, since it uses as much as digits as its factorization.

19994671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28528.

The product of its digits is 122472, while the sum is 46.

The square root of 19994671 is about 4471.5401149939. The cubic root of 19994671 is about 271.4176509655.

It can be divided in two parts, 1999 and 4671, that added together give a triangular number (6670 = T₁₁₅).

The spelling of 19994671 in words is "nineteen million, nine hundred ninety-four thousand, six hundred seventy-one".