20320133 has 4 divisors (see below), whose sum is σ = 20815788. Its totient is φ = 19824480.

The previous prime is 20320103. The next prime is 20320171. The reversal of 20320133 is 33102302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33102302 = 2 ⋅16551151.

It can be written as a sum of positive squares in 2 ways, for example, as 10876804 + 9443329 = 3298^2 + 3073^2 .

It is a cyclic number.

It is not a de Polignac number, because 20320133 - 2¹⁰ = 20319109 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 (20320103) 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, 247766 + ... + 247847.

It is an arithmetic number, because the mean of its divisors is an integer number (5203947).

Almost surely, 2^20320133 is an apocalyptic number.

It is an amenable number.

20320133 is a deficient number, since it is larger than the sum of its proper divisors (495655).

20320133 is an equidigital number, since it uses as much as digits as its factorization.

20320133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495654.

The product of its (nonzero) digits is 108, while the sum is 14.

The square root of 20320133 is about 4507.7858201117. The cubic root of 20320133 is about 272.8823933134.

Adding to 20320133 its reverse (33102302), we get a palindrome (53422435).

The spelling of 20320133 in words is "twenty million, three hundred twenty thousand, one hundred thirty-three".