20910011 has 2 divisors, whose sum is σ = 20910012. Its totient is φ = 20910010.

The previous prime is 20909989. The next prime is 20910023. The reversal of 20910011 is 11001902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20910011 - 2⁶ = 20909947 is a prime.

It is not a weakly prime, because it can be changed into another prime (20910031) 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, 10455005 + 10455006.

It is an arithmetic number, because the mean of its divisors is an integer number (10455006).

Almost surely, 2^20910011 is an apocalyptic number.

20910011 is a deficient number, since it is larger than the sum of its proper divisors (1).

20910011 is an equidigital number, since it uses as much as digits as its factorization.

20910011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 20910011 is about 4572.7465488479. The cubic root of 20910011 is about 275.4977695325.

Adding to 20910011 its reverse (11001902), we get a palindrome (31911913).

The spelling of 20910011 in words is "twenty million, nine hundred ten thousand, eleven".