19966241 has 4 divisors (see below), whose sum is σ = 20160192. Its totient is φ = 19772292.

The previous prime is 19966237. The next prime is 19966253. The reversal of 19966241 is 14266991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14266991 = 47 ⋅303553.

It is not a de Polignac number, because 19966241 - 2² = 19966237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19966195 and 19966204.

It is not an unprimeable number, because it can be changed into a prime (19966841) 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, 96821 + ... + 97026.

It is an arithmetic number, because the mean of its divisors is an integer number (5040048).

Almost surely, 2^19966241 is an apocalyptic number.

It is an amenable number.

19966241 is a deficient number, since it is larger than the sum of its proper divisors (193951).

19966241 is a wasteful number, since it uses less digits than its factorization.

19966241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193950.

The product of its digits is 23328, while the sum is 38.

The square root of 19966241 is about 4468.3599899740. The cubic root of 19966241 is about 271.2889489399.

The spelling of 19966241 in words is "nineteen million, nine hundred sixty-six thousand, two hundred forty-one".