20404235 has 4 divisors (see below), whose sum is σ = 24485088. Its totient is φ = 16323384.

The previous prime is 20404213. The next prime is 20404249. The reversal of 20404235 is 53240402.

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 20404235 - 2⁶ = 20404171 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2040419 + ... + 2040428.

It is an arithmetic number, because the mean of its divisors is an integer number (6121272).

Almost surely, 2^20404235 is an apocalyptic number.

20404235 is a deficient number, since it is larger than the sum of its proper divisors (4080853).

20404235 is an equidigital number, since it uses as much as digits as its factorization.

20404235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4080852.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 20404235 is about 4517.1047143054. The cubic root of 20404235 is about 273.2583482919.

Adding to 20404235 its reverse (53240402), we get a palindrome (73644637).

The spelling of 20404235 in words is "twenty million, four hundred four thousand, two hundred thirty-five".