19794661 has 4 divisors (see below), whose sum is σ = 20215872. Its totient is φ = 19373452.

The previous prime is 19794641. The next prime is 19794701. The reversal of 19794661 is 16649791.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 19794661 - 2⁵ = 19794629 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 (19794611) 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, 210535 + ... + 210628.

It is an arithmetic number, because the mean of its divisors is an integer number (5053968).

Almost surely, 2^19794661 is an apocalyptic number.

It is an amenable number.

19794661 is a deficient number, since it is larger than the sum of its proper divisors (421211).

19794661 is an equidigital number, since it uses as much as digits as its factorization.

19794661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421210.

The product of its digits is 81648, while the sum is 43.

The square root of 19794661 is about 4449.1191262990. The cubic root of 19794661 is about 270.5096045416.

The spelling of 19794661 in words is "nineteen million, seven hundred ninety-four thousand, six hundred sixty-one".