20235205135 has 4 divisors (see below), whose sum is σ = 24282246168. Its totient is φ = 16188164104.

The previous prime is 20235205117. The next prime is 20235205147. The reversal of 20235205135 is 53150253202.

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 20235205135 - 2²³ = 20226816527 is a prime.

It is a Duffinian number.

It is a congruent 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, 2023520509 + ... + 2023520518.

It is an arithmetic number, because the mean of its divisors is an integer number (6070561542).

Almost surely, 2^20235205135 is an apocalyptic number.

20235205135 is a deficient number, since it is larger than the sum of its proper divisors (4047041033).

20235205135 is an equidigital number, since it uses as much as digits as its factorization.

20235205135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4047041032.

The product of its (nonzero) digits is 9000, while the sum is 28.

Adding to 20235205135 its reverse (53150253202), we get a palindrome (73385458337).

The spelling of 20235205135 in words is "twenty billion, two hundred thirty-five million, two hundred five thousand, one hundred thirty-five".