20411381 has 2 divisors, whose sum is σ = 20411382. Its totient is φ = 20411380.

The previous prime is 20411371. The next prime is 20411387. The reversal of 20411381 is 18311402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19722481 + 688900 = 4441^2 + 830^2 .

It is a cyclic number.

It is not a de Polignac number, because 20411381 - 2¹⁸ = 20149237 is a prime.

It is a super-2 number, since 2×20411381² = 833248948654322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20411387) 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 as a sum of consecutive naturals, namely, 10205690 + 10205691.

It is an arithmetic number, because the mean of its divisors is an integer number (10205691).

Almost surely, 2^20411381 is an apocalyptic number.

It is an amenable number.

20411381 is a deficient number, since it is larger than the sum of its proper divisors (1).

20411381 is an equidigital number, since it uses as much as digits as its factorization.

20411381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 20411381 is about 4517.8956384582. The cubic root of 20411381 is about 273.2902448768.

Adding to 20411381 its reverse (18311402), we get a palindrome (38722783).

The spelling of 20411381 in words is "twenty million, four hundred eleven thousand, three hundred eighty-one".