20020128311 has 4 divisors (see below), whose sum is σ = 20020424232. Its totient is φ = 20019832392.

The previous prime is 20020128277. The next prime is 20020128341. The reversal of 20020128311 is 11382102002.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 11382102002 = 2 ⋅5691051001.

It is a cyclic number.

It is not a de Polignac number, because 20020128311 - 2²⁶ = 19953019447 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 (20020128341) 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, 9080 + ... + 200306.

It is an arithmetic number, because the mean of its divisors is an integer number (5005106058).

Almost surely, 2^20020128311 is an apocalyptic number.

20020128311 is a deficient number, since it is larger than the sum of its proper divisors (295921).

20020128311 is a wasteful number, since it uses less digits than its factorization.

20020128311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295920.

The product of its (nonzero) digits is 192, while the sum is 20.

The spelling of 20020128311 in words is "twenty billion, twenty million, one hundred twenty-eight thousand, three hundred eleven".