20338261 has 2 divisors, whose sum is σ = 20338262. Its totient is φ = 20338260.

The previous prime is 20338259. The next prime is 20338267. The reversal of 20338261 is 16283302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20304036 + 34225 = 4506^2 + 185^2 .

It is a cyclic number.

It is not a de Polignac number, because 20338261 - 2¹ = 20338259 is a prime.

Together with 20338259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20338267) 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, 10169130 + 10169131.

It is an arithmetic number, because the mean of its divisors is an integer number (10169131).

Almost surely, 2^20338261 is an apocalyptic number.

It is an amenable number.

20338261 is a deficient number, since it is larger than the sum of its proper divisors (1).

20338261 is an equidigital number, since it uses as much as digits as its factorization.

20338261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 20338261 is about 4509.7961151254. The cubic root of 20338261 is about 272.9635171542.

The spelling of 20338261 in words is "twenty million, three hundred thirty-eight thousand, two hundred sixty-one".