19728022 has 4 divisors (see below), whose sum is σ = 29592036. Its totient is φ = 9864010.

The previous prime is 19728017. The next prime is 19728073. The reversal of 19728022 is 22082791.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 as a sum of consecutive naturals, namely, 4932004 + ... + 4932007.

It is an arithmetic number, because the mean of its divisors is an integer number (7398009).

Almost surely, 2^19728022 is an apocalyptic number.

19728022 is a deficient number, since it is larger than the sum of its proper divisors (9864014).

19728022 is an equidigital number, since it uses as much as digits as its factorization.

19728022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9864013.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 19728022 is about 4441.6238021697. The cubic root of 19728022 is about 270.2057051507.

The spelling of 19728022 in words is "nineteen million, seven hundred twenty-eight thousand, twenty-two".