19668730 has 8 divisors (see below), whose sum is σ = 35403732. Its totient is φ = 7867488.

The previous prime is 19668707. The next prime is 19668731. The reversal of 19668730 is 3786691.

It can be written as a sum of positive squares in 2 ways, for example, as 19633761 + 34969 = 4431^2 + 187^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (19668731) 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, 983427 + ... + 983446.

Almost surely, 2^19668730 is an apocalyptic number.

19668730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19668730 is a deficient number, since it is larger than the sum of its proper divisors (15735002).

19668730 is a wasteful number, since it uses less digits than its factorization.

19668730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1966880.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 19668730 is about 4434.9441935610. The cubic root of 19668730 is about 269.9347350255.

The spelling of 19668730 in words is "nineteen million, six hundred sixty-eight thousand, seven hundred thirty".