19780804 has 12 divisors (see below), whose sum is σ = 34650000. Its totient is φ = 9880808.

The previous prime is 19780781. The next prime is 19780837. The reversal of 19780804 is 40808791.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4347 + ... + 7645.

It is an arithmetic number, because the mean of its divisors is an integer number (2887500).

Almost surely, 2^19780804 is an apocalyptic number.

It is an amenable number.

19780804 is a deficient number, since it is larger than the sum of its proper divisors (14869196).

19780804 is a wasteful number, since it uses less digits than its factorization.

19780804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4802 (or 4800 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 19780804 is about 4447.5615791128. The cubic root of 19780804 is about 270.4464675403.

The spelling of 19780804 in words is "nineteen million, seven hundred eighty thousand, eight hundred four".