20326381 has 2 divisors, whose sum is σ = 20326382. Its totient is φ = 20326380.

The previous prime is 20326367. The next prime is 20326433. The reversal of 20326381 is 18362302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14402025 + 5924356 = 3795^2 + 2434^2 .

It is a cyclic number.

It is not a de Polignac number, because 20326381 - 2⁵ = 20326349 is a prime.

It is a super-2 number, since 2×20326381² = 826323529114322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20326081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10163190 + 10163191.

It is an arithmetic number, because the mean of its divisors is an integer number (10163191).

Almost surely, 2^20326381 is an apocalyptic number.

It is an amenable number.

20326381 is a deficient number, since it is larger than the sum of its proper divisors (1).

20326381 is an equidigital number, since it uses as much as digits as its factorization.

20326381 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 20326381 is about 4508.4787900133. The cubic root of 20326381 is about 272.9103589190.

Adding to 20326381 its reverse (18362302), we get a palindrome (38688683).

The spelling of 20326381 in words is "twenty million, three hundred twenty-six thousand, three hundred eighty-one".