19804072 has 8 divisors (see below), whose sum is σ = 37132650. Its totient is φ = 9902032.

The previous prime is 19804063. The next prime is 19804079. The reversal of 19804072 is 27040891.

It can be written as a sum of positive squares in only one way, i.e., 11195716 + 8608356 = 3346^2 + 2934^2 .

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

It is a pancake number, because a pancake can be divided into 19804072 parts by 6293 straight cuts.

It is not an unprimeable number, because it can be changed into a prime (19804079) by changing a digit.

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, 1237747 + ... + 1237762.

Almost surely, 2^19804072 is an apocalyptic number.

It is an amenable number.

19804072 is a deficient number, since it is larger than the sum of its proper divisors (17328578).

19804072 is a wasteful number, since it uses less digits than its factorization.

19804072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2475515 (or 2475511 counting only the distinct ones).

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

The square root of 19804072 is about 4450.1766257082. The cubic root of 19804072 is about 270.5524673208.

The spelling of 19804072 in words is "nineteen million, eight hundred four thousand, seventy-two".