20863111 has 2 divisors, whose sum is σ = 20863112. Its totient is φ = 20863110.

The previous prime is 20863103. The next prime is 20863123. The reversal of 20863111 is 11136802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20863111 - 2³ = 20863103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20863411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10431555 + 10431556.

It is an arithmetic number, because the mean of its divisors is an integer number (10431556).

Almost surely, 2^20863111 is an apocalyptic number.

20863111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20863111 is an equidigital number, since it uses as much as digits as its factorization.

20863111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 20863111 is about 4567.6154610475. The cubic root of 20863111 is about 275.2916399153.

Adding to 20863111 its reverse (11136802), we get a palindrome (31999913).

The spelling of 20863111 in words is "twenty million, eight hundred sixty-three thousand, one hundred eleven".