20368381 has 4 divisors (see below), whose sum is σ = 22220064. Its totient is φ = 18516700.

The previous prime is 20368373. The next prime is 20368417. The reversal of 20368381 is 18386302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20368381 - 2³ = 20368373 is a prime.

It is a super-2 number, since 2×20368381² = 829741889122322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20368301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 925825 + ... + 925846.

It is an arithmetic number, because the mean of its divisors is an integer number (5555016).

Almost surely, 2^20368381 is an apocalyptic number.

It is an amenable number.

20368381 is a deficient number, since it is larger than the sum of its proper divisors (1851683).

20368381 is a wasteful number, since it uses less digits than its factorization.

20368381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1851682.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 20368381 is about 4513.1342767527. The cubic root of 20368381 is about 273.0981993646.

The spelling of 20368381 in words is "twenty million, three hundred sixty-eight thousand, three hundred eighty-one".