20730233 has 2 divisors, whose sum is σ = 20730234. Its totient is φ = 20730232.

The previous prime is 20730217. The next prime is 20730239. The reversal of 20730233 is 33203702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14115049 + 6615184 = 3757^2 + 2572^2 .

It is a cyclic number.

It is not a de Polignac number, because 20730233 - 2⁴ = 20730217 is a prime.

It is not a weakly prime, because it can be changed into another prime (20730239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10365116 + 10365117.

It is an arithmetic number, because the mean of its divisors is an integer number (10365117).

Almost surely, 2^20730233 is an apocalyptic number.

It is an amenable number.

20730233 is a deficient number, since it is larger than the sum of its proper divisors (1).

20730233 is an equidigital number, since it uses as much as digits as its factorization.

20730233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 20.

The square root of 20730233 is about 4553.0465624678. The cubic root of 20730233 is about 274.7059468427.

Adding to 20730233 its reverse (33203702), we get a palindrome (53933935).

The spelling of 20730233 in words is "twenty million, seven hundred thirty thousand, two hundred thirty-three".