20394841 has 2 divisors, whose sum is σ = 20394842. Its totient is φ = 20394840.

The previous prime is 20394839. The next prime is 20394863. The reversal of 20394841 is 14849302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15681600 + 4713241 = 3960^2 + 2171^2 .

It is a cyclic number.

It is not a de Polignac number, because 20394841 - 2¹ = 20394839 is a prime.

Together with 20394839, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20394811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10197420 + 10197421.

It is an arithmetic number, because the mean of its divisors is an integer number (10197421).

Almost surely, 2^20394841 is an apocalyptic number.

It is an amenable number.

20394841 is a deficient number, since it is larger than the sum of its proper divisors (1).

20394841 is an equidigital number, since it uses as much as digits as its factorization.

20394841 is an evil number, because the sum of its binary digits is even.

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

The square root of 20394841 is about 4516.0647692432. The cubic root of 20394841 is about 273.2164062969.

The spelling of 20394841 in words is "twenty million, three hundred ninety-four thousand, eight hundred forty-one".