19722008 has 8 divisors (see below), whose sum is σ = 36978780. Its totient is φ = 9861000.

The previous prime is 19721963. The next prime is 19722013. The reversal of 19722008 is 80022791.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1232618 + ... + 1232633.

Almost surely, 2^19722008 is an apocalyptic number.

It is an amenable number.

19722008 is a deficient number, since it is larger than the sum of its proper divisors (17256772).

19722008 is a wasteful number, since it uses less digits than its factorization.

19722008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2465257 (or 2465253 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 19722008 is about 4440.9467459090. The cubic root of 19722008 is about 270.1782453566.

Adding to 19722008 its reverse (80022791), we get a palindrome (99744799).

The spelling of 19722008 in words is "nineteen million, seven hundred twenty-two thousand, eight".