20867911 has 2 divisors, whose sum is σ = 20867912. Its totient is φ = 20867910.

The previous prime is 20867879. The next prime is 20867933. The reversal of 20867911 is 11976802.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20867911 - 2⁵ = 20867879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20867971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10433955 + 10433956.

It is an arithmetic number, because the mean of its divisors is an integer number (10433956).

Almost surely, 2^20867911 is an apocalyptic number.

20867911 is a deficient number, since it is larger than the sum of its proper divisors (1).

20867911 is an equidigital number, since it uses as much as digits as its factorization.

20867911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 20867911 is about 4568.1408691064. The cubic root of 20867911 is about 275.3127505180.

The spelling of 20867911 in words is "twenty million, eight hundred sixty-seven thousand, nine hundred eleven".