20135128863 has 4 divisors (see below), whose sum is σ = 26846838488. Its totient is φ = 13423419240.

The previous prime is 20135128847. The next prime is 20135128879. The reversal of 20135128863 is 36882153102.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20135128847) and next prime (20135128879).

It is not a de Polignac number, because 20135128863 - 2⁴ = 20135128847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20135128813) 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, 3355854808 + ... + 3355854813.

It is an arithmetic number, because the mean of its divisors is an integer number (6711709622).

Almost surely, 2^20135128863 is an apocalyptic number.

20135128863 is a deficient number, since it is larger than the sum of its proper divisors (6711709625).

20135128863 is an equidigital number, since it uses as much as digits as its factorization.

20135128863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6711709624.

The product of its (nonzero) digits is 69120, while the sum is 39.

The spelling of 20135128863 in words is "twenty billion, one hundred thirty-five million, one hundred twenty-eight thousand, eight hundred sixty-three".