20425235 has 4 divisors (see below), whose sum is σ = 24510288. Its totient is φ = 16340184.

The previous prime is 20425231. The next prime is 20425243. The reversal of 20425235 is 53252402.

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 20425235 - 2² = 20425231 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20425235.

It is not an unprimeable number, because it can be changed into a prime (20425231) 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, 2042519 + ... + 2042528.

It is an arithmetic number, because the mean of its divisors is an integer number (6127572).

Almost surely, 2^20425235 is an apocalyptic number.

20425235 is a deficient number, since it is larger than the sum of its proper divisors (4085053).

20425235 is an equidigital number, since it uses as much as digits as its factorization.

20425235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4085052.

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 20425235 is about 4519.4286143273. The cubic root of 20425235 is about 273.3520618075.

Adding to 20425235 its reverse (53252402), we get a palindrome (73677637).

The spelling of 20425235 in words is "twenty million, four hundred twenty-five thousand, two hundred thirty-five".