19808093 has 4 divisors (see below), whose sum is σ = 19825788. Its totient is φ = 19790400.

The previous prime is 19808071. The next prime is 19808123. The reversal of 19808093 is 39080891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 209764 + 19598329 = 458^2 + 4427^2 .

It is a cyclic number.

It is not a de Polignac number, because 19808093 - 2¹⁶ = 19742557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19808053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7046 + ... + 9447.

It is an arithmetic number, because the mean of its divisors is an integer number (4956447).

Almost surely, 2^19808093 is an apocalyptic number.

It is an amenable number.

19808093 is a deficient number, since it is larger than the sum of its proper divisors (17695).

19808093 is a wasteful number, since it uses less digits than its factorization.

19808093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17694.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 19808093 is about 4450.6283825995. The cubic root of 19808093 is about 270.5707769871.

The spelling of 19808093 in words is "nineteen million, eight hundred eight thousand, ninety-three".