20404003 has 4 divisors (see below), whose sum is σ = 20424160. Its totient is φ = 20383848.

The previous prime is 20403989. The next prime is 20404009. The reversal of 20404003 is 30040402.

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

It is a cyclic number.

It is not a de Polignac number, because 20404003 - 2⁹ = 20403491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20404009) 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, 8475 + ... + 10612.

It is an arithmetic number, because the mean of its divisors is an integer number (5106040).

Almost surely, 2^20404003 is an apocalyptic number.

20404003 is a deficient number, since it is larger than the sum of its proper divisors (20157).

20404003 is a wasteful number, since it uses less digits than its factorization.

20404003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20156.

The product of its (nonzero) digits is 96, while the sum is 13.

The square root of 20404003 is about 4517.0790340662. The cubic root of 20404003 is about 273.2573126217.

Adding to 20404003 its reverse (30040402), we get a palindrome (50444405).

The spelling of 20404003 in words is "twenty million, four hundred four thousand, three".