20830133 has 2 divisors, whose sum is σ = 20830134. Its totient is φ = 20830132.

The previous prime is 20830067. The next prime is 20830141. The reversal of 20830133 is 33103802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13823524 + 7006609 = 3718^2 + 2647^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20830133 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 (20830153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10415066 + 10415067.

It is an arithmetic number, because the mean of its divisors is an integer number (10415067).

Almost surely, 2^20830133 is an apocalyptic number.

It is an amenable number.

20830133 is a deficient number, since it is larger than the sum of its proper divisors (1).

20830133 is an equidigital number, since it uses as much as digits as its factorization.

20830133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 20830133 is about 4564.0040534601. The cubic root of 20830133 is about 275.1465136626.

Adding to 20830133 its reverse (33103802), we get a palindrome (53933935).

The spelling of 20830133 in words is "twenty million, eight hundred thirty thousand, one hundred thirty-three".