20204493 has 4 divisors (see below), whose sum is σ = 26939328. Its totient is φ = 13469660.

The previous prime is 20204477. The next prime is 20204519. The reversal of 20204493 is 39440202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20204493 - 2⁴ = 20204477 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20204413) 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 in 3 ways as a sum of consecutive naturals, for example, 3367413 + ... + 3367418.

It is an arithmetic number, because the mean of its divisors is an integer number (6734832).

Almost surely, 2^20204493 is an apocalyptic number.

It is an amenable number.

20204493 is a deficient number, since it is larger than the sum of its proper divisors (6734835).

20204493 is an equidigital number, since it uses as much as digits as its factorization.

20204493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6734834.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 20204493 is about 4494.9408227473. The cubic root of 20204493 is about 272.3637587335.

Adding to 20204493 its reverse (39440202), we get a palindrome (59644695).

The spelling of 20204493 in words is "twenty million, two hundred four thousand, four hundred ninety-three".