19804742 has 8 divisors (see below), whose sum is σ = 29783136. Its totient is φ = 9877032.

The previous prime is 19804721. The next prime is 19804769. The reversal of 19804742 is 24740891.

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

It is a congruent number.

It is an unprimeable number.

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, 11678 + ... + 13265.

It is an arithmetic number, because the mean of its divisors is an integer number (3722892).

Almost surely, 2^19804742 is an apocalyptic number.

19804742 is a deficient number, since it is larger than the sum of its proper divisors (9978394).

19804742 is a wasteful number, since it uses less digits than its factorization.

19804742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25342.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 19804742 is about 4450.2519029826. The cubic root of 19804742 is about 270.5555183450. Note that the first 4 decimals are identical.

The spelling of 19804742 in words is "nineteen million, eight hundred four thousand, seven hundred forty-two".