19804057 has 16 divisors (see below), whose sum is σ = 24492160. Its totient is φ = 15593472.

The previous prime is 19804027. The next prime is 19804063. The reversal of 19804057 is 75040891.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 19804057 - 2¹⁹ = 19279769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19804007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25369 + ... + 26137.

It is an arithmetic number, because the mean of its divisors is an integer number (1530760).

Almost surely, 2^19804057 is an apocalyptic number.

It is an amenable number.

19804057 is a deficient number, since it is larger than the sum of its proper divisors (4688103).

19804057 is a wasteful number, since it uses less digits than its factorization.

19804057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 19804057 is about 4450.1749403816. The cubic root of 19804057 is about 270.5523990135.

The spelling of 19804057 in words is "nineteen million, eight hundred four thousand, fifty-seven".