20333381 has 2 divisors, whose sum is σ = 20333382. Its totient is φ = 20333380.

The previous prime is 20333353. The next prime is 20333393. The reversal of 20333381 is 18333302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16273156 + 4060225 = 4034^2 + 2015^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20333381 is a prime.

It is a super-2 number, since 2×20333381² = 826892765782322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20333981) 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 as a sum of consecutive naturals, namely, 10166690 + 10166691.

It is an arithmetic number, because the mean of its divisors is an integer number (10166691).

Almost surely, 2^20333381 is an apocalyptic number.

It is an amenable number.

20333381 is a deficient number, since it is larger than the sum of its proper divisors (1).

20333381 is an equidigital number, since it uses as much as digits as its factorization.

20333381 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 20333381 is about 4509.2550382519. The cubic root of 20333381 is about 272.9416836173.

Adding to 20333381 its reverse (18333302), we get a palindrome (38666683).

The spelling of 20333381 in words is "twenty million, three hundred thirty-three thousand, three hundred eighty-one".