20380381 has 4 divisors (see below), whose sum is σ = 23291872. Its totient is φ = 17468892.

The previous prime is 20380343. The next prime is 20380427. The reversal of 20380381 is 18308302.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18308302 = 2 ⋅9154151.

It is not a de Polignac number, because 20380381 - 2⁷ = 20380253 is a prime.

It is a super-2 number, since 2×20380381² = 830719859410322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20380681) 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, 1455735 + ... + 1455748.

It is an arithmetic number, because the mean of its divisors is an integer number (5822968).

Almost surely, 2^20380381 is an apocalyptic number.

It is an amenable number.

20380381 is a deficient number, since it is larger than the sum of its proper divisors (2911491).

20380381 is an equidigital number, since it uses as much as digits as its factorization.

20380381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2911490.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 20380381 is about 4514.4635340204. The cubic root of 20380381 is about 273.1518206289.

Adding to 20380381 its reverse (18308302), we get a palindrome (38688683).

The spelling of 20380381 in words is "twenty million, three hundred eighty thousand, three hundred eighty-one".