20330533 has 4 divisors (see below), whose sum is σ = 20341228. Its totient is φ = 20319840.

The previous prime is 20330509. The next prime is 20330539. The reversal of 20330533 is 33503302.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 17447329 + 2883204 = 4177^2 + 1698^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20330533 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20330533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20330539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1638 + ... + 6583.

It is an arithmetic number, because the mean of its divisors is an integer number (5085307).

Almost surely, 2^20330533 is an apocalyptic number.

It is an amenable number.

20330533 is a deficient number, since it is larger than the sum of its proper divisors (10695).

20330533 is an equidigital number, since it uses as much as digits as its factorization.

20330533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10694.

The product of its (nonzero) digits is 810, while the sum is 19.

The square root of 20330533 is about 4508.9392322363. The cubic root of 20330533 is about 272.9289398077.

Adding to 20330533 its reverse (33503302), we get a palindrome (53833835).

The spelling of 20330533 in words is "twenty million, three hundred thirty thousand, five hundred thirty-three".