20775211 has 2 divisors, whose sum is σ = 20775212. Its totient is φ = 20775210.

The previous prime is 20775199. The next prime is 20775217. The reversal of 20775211 is 11257702.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20775211 - 2¹⁵ = 20742443 is a prime.

It is equal to p_1316653 and since 20775211 and 1316653 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20775217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10387605 + 10387606.

It is an arithmetic number, because the mean of its divisors is an integer number (10387606).

Almost surely, 2^20775211 is an apocalyptic number.

20775211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20775211 is an equidigital number, since it uses as much as digits as its factorization.

20775211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 20775211 is about 4557.9832162920. The cubic root of 20775211 is about 274.9044781189.

The spelling of 20775211 in words is "twenty million, seven hundred seventy-five thousand, two hundred eleven".