20333993 has 2 divisors, whose sum is σ = 20333994. Its totient is φ = 20333992.

The previous prime is 20333987. The next prime is 20334007. The reversal of 20333993 is 39933302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11854249 + 8479744 = 3443^2 + 2912^2 .

It is a cyclic number.

It is not a de Polignac number, because 20333993 - 2⁴ = 20333977 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20333953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10166996 + 10166997.

It is an arithmetic number, because the mean of its divisors is an integer number (10166997).

Almost surely, 2^20333993 is an apocalyptic number.

It is an amenable number.

20333993 is a deficient number, since it is larger than the sum of its proper divisors (1).

20333993 is an equidigital number, since it uses as much as digits as its factorization.

20333993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13122, while the sum is 32.

The square root of 20333993 is about 4509.3228981744. The cubic root of 20333993 is about 272.9444219492.

The spelling of 20333993 in words is "twenty million, three hundred thirty-three thousand, nine hundred ninety-three".