20128133 has 2 divisors, whose sum is σ = 20128134. Its totient is φ = 20128132.

The previous prime is 20128123. The next prime is 20128169. The reversal of 20128133 is 33182102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19918369 + 209764 = 4463^2 + 458^2 .

It is a cyclic number.

It is not a de Polignac number, because 20128133 - 2¹⁰ = 20127109 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20128123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10064066 + 10064067.

It is an arithmetic number, because the mean of its divisors is an integer number (10064067).

Almost surely, 2^20128133 is an apocalyptic number.

It is an amenable number.

20128133 is a deficient number, since it is larger than the sum of its proper divisors (1).

20128133 is an equidigital number, since it uses as much as digits as its factorization.

20128133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20128133 is about 4486.4387881704. The cubic root of 20128133 is about 272.0202055708.

The spelling of 20128133 in words is "twenty million, one hundred twenty-eight thousand, one hundred thirty-three".