20894911 has 2 divisors, whose sum is σ = 20894912. Its totient is φ = 20894910.

The previous prime is 20894869. The next prime is 20894957. The reversal of 20894911 is 11949802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20894911 - 2⁹ = 20894399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20894311) 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, 10447455 + 10447456.

It is an arithmetic number, because the mean of its divisors is an integer number (10447456).

Almost surely, 2^20894911 is an apocalyptic number.

20894911 is a deficient number, since it is larger than the sum of its proper divisors (1).

20894911 is an equidigital number, since it uses as much as digits as its factorization.

20894911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 20894911 is about 4571.0951641811. The cubic root of 20894911 is about 275.4314373804.

The spelling of 20894911 in words is "twenty million, eight hundred ninety-four thousand, nine hundred eleven".