20333813 has 2 divisors, whose sum is σ = 20333814. Its totient is φ = 20333812.

The previous prime is 20333791. The next prime is 20333849. The reversal of 20333813 is 31833302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19562929 + 770884 = 4423^2 + 878^2 .

It is a cyclic number.

It is not a de Polignac number, because 20333813 - 2²⁰ = 19285237 is a prime.

It is a super-2 number, since 2×20333813² = 826927902237938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20333113) 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, 10166906 + 10166907.

It is an arithmetic number, because the mean of its divisors is an integer number (10166907).

Almost surely, 2^20333813 is an apocalyptic number.

It is an amenable number.

20333813 is a deficient number, since it is larger than the sum of its proper divisors (1).

20333813 is an equidigital number, since it uses as much as digits as its factorization.

20333813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 20333813 is about 4509.3029394797. The cubic root of 20333813 is about 272.9436165631.

The spelling of 20333813 in words is "twenty million, three hundred thirty-three thousand, eight hundred thirteen".