20135128443 has 16 divisors (see below), whose sum is σ = 27503389056. Its totient is φ = 13095875520.

The previous prime is 20135128427. The next prime is 20135128451. The reversal of 20135128443 is 34482153102.

It is not a de Polignac number, because 20135128443 - 2⁴ = 20135128427 is a prime.

It is a super-2 number, since 2×20135128443² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20135128543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19488 + ... + 201618.

It is an arithmetic number, because the mean of its divisors is an integer number (1718961816).

Almost surely, 2^20135128443 is an apocalyptic number.

20135128443 is a deficient number, since it is larger than the sum of its proper divisors (7368260613).

20135128443 is a wasteful number, since it uses less digits than its factorization.

20135128443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183034.

The product of its (nonzero) digits is 23040, while the sum is 33.

The spelling of 20135128443 in words is "twenty billion, one hundred thirty-five million, one hundred twenty-eight thousand, four hundred forty-three".