19804923 has 12 divisors (see below), whose sum is σ = 28647528. Its totient is φ = 13184640.

The previous prime is 19804901. The next prime is 19804933. The reversal of 19804923 is 32940891.

It is not a de Polignac number, because 19804923 - 2²² = 15610619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19804933) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8811 + ... + 10827.

It is an arithmetic number, because the mean of its divisors is an integer number (2387294).

Almost surely, 2^19804923 is an apocalyptic number.

19804923 is a deficient number, since it is larger than the sum of its proper divisors (8842605).

19804923 is a wasteful number, since it uses less digits than its factorization.

19804923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3114 (or 3111 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 19804923 is about 4450.2722388636. The cubic root of 19804923 is about 270.5563425651.

It can be divided in two parts, 1980 and 4923, that added together give a triangular number (6903 = T₁₁₇).

The spelling of 19804923 in words is "nineteen million, eight hundred four thousand, nine hundred twenty-three".