20441381 has 4 divisors (see below), whose sum is σ = 20876352. Its totient is φ = 20006412.

The previous prime is 20441363. The next prime is 20441401. The reversal of 20441381 is 18314402.

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: 18314402 = 2 ⋅9157201.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20441381 is a prime.

It is a super-2 number, since 2×20441381² = 835700114374322, 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 (20444381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217415 + ... + 217508.

It is an arithmetic number, because the mean of its divisors is an integer number (5219088).

Almost surely, 2^20441381 is an apocalyptic number.

It is an amenable number.

20441381 is a deficient number, since it is larger than the sum of its proper divisors (434971).

20441381 is an equidigital number, since it uses as much as digits as its factorization.

20441381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434970.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 20441381 is about 4521.2145492113. The cubic root of 20441381 is about 273.4240704436.

Adding to 20441381 its reverse (18314402), we get a palindrome (38755783).

The spelling of 20441381 in words is "twenty million, four hundred forty-one thousand, three hundred eighty-one".