20305400135 has 4 divisors (see below), whose sum is σ = 24366480168. Its totient is φ = 16244320104.

The previous prime is 20305400113. The next prime is 20305400189. The reversal of 20305400135 is 53100450302.

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 20305400135 - 2¹⁰ = 20305399111 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 20305400135.

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, 2030540009 + ... + 2030540018.

It is an arithmetic number, because the mean of its divisors is an integer number (6091620042).

Almost surely, 2^20305400135 is an apocalyptic number.

20305400135 is a deficient number, since it is larger than the sum of its proper divisors (4061080033).

20305400135 is an equidigital number, since it uses as much as digits as its factorization.

20305400135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4061080032.

The product of its (nonzero) digits is 1800, while the sum is 23.

Adding to 20305400135 its reverse (53100450302), we get a palindrome (73405850437).

The spelling of 20305400135 in words is "twenty billion, three hundred five million, four hundred thousand, one hundred thirty-five".