20505110135 has 4 divisors (see below), whose sum is σ = 24606132168. Its totient is φ = 16404088104.

The previous prime is 20505110113. The next prime is 20505110141. The reversal of 20505110135 is 53101150502.

It is a happy number.

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 20505110135 - 2⁶ = 20505110071 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 20505110135.

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, 2050511009 + ... + 2050511018.

It is an arithmetic number, because the mean of its divisors is an integer number (6151533042).

Almost surely, 2^20505110135 is an apocalyptic number.

20505110135 is a deficient number, since it is larger than the sum of its proper divisors (4101022033).

20505110135 is an equidigital number, since it uses as much as digits as its factorization.

20505110135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4101022032.

The product of its (nonzero) digits is 750, while the sum is 23.

Adding to 20505110135 its reverse (53101150502), we get a palindrome (73606260637).

The spelling of 20505110135 in words is "twenty billion, five hundred five million, one hundred ten thousand, one hundred thirty-five".