20305235 has 4 divisors (see below), whose sum is σ = 24366288. Its totient is φ = 16244184.

The previous prime is 20305231. The next prime is 20305247. The reversal of 20305235 is 53250302.

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 20305235 - 2² = 20305231 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20305231) 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, 2030519 + ... + 2030528.

It is an arithmetic number, because the mean of its divisors is an integer number (6091572).

Almost surely, 2^20305235 is an apocalyptic number.

20305235 is a deficient number, since it is larger than the sum of its proper divisors (4061053).

20305235 is an equidigital number, since it uses as much as digits as its factorization.

20305235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4061052.

The product of its (nonzero) digits is 900, while the sum is 20.

The square root of 20305235 is about 4506.1330428650. The cubic root of 20305235 is about 272.8156877816.

Adding to 20305235 its reverse (53250302), we get a palindrome (73555537).

The spelling of 20305235 in words is "twenty million, three hundred five thousand, two hundred thirty-five".