20443133 has 4 divisors (see below), whose sum is σ = 20941788. Its totient is φ = 19944480.

The previous prime is 20443123. The next prime is 20443141. The reversal of 20443133 is 33134402.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7171684 + 13271449 = 2678^2 + 3643^2 .

It is a cyclic number.

It is not a de Polignac number, because 20443133 - 2²² = 16248829 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 (20443123) 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, 249266 + ... + 249347.

It is an arithmetic number, because the mean of its divisors is an integer number (5235447).

Almost surely, 2^20443133 is an apocalyptic number.

It is an amenable number.

20443133 is a deficient number, since it is larger than the sum of its proper divisors (498655).

20443133 is an equidigital number, since it uses as much as digits as its factorization.

20443133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498654.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 20443133 is about 4521.4082983071. The cubic root of 20443133 is about 273.4318818089.

Adding to 20443133 its reverse (33134402), we get a palindrome (53577535).

The spelling of 20443133 in words is "twenty million, four hundred forty-three thousand, one hundred thirty-three".