20111087 has 2 divisors, whose sum is σ = 20111088. Its totient is φ = 20111086.

The previous prime is 20111083. The next prime is 20111093. The reversal of 20111087 is 78011102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20111087 - 2² = 20111083 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20111081) 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, 10055543 + 10055544.

It is an arithmetic number, because the mean of its divisors is an integer number (10055544).

Almost surely, 2^20111087 is an apocalyptic number.

20111087 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111087 is an equidigital number, since it uses as much as digits as its factorization.

20111087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 20111087 is about 4484.5386607766. The cubic root of 20111087 is about 271.9433949034.

Adding to 20111087 its reverse (78011102), we get a palindrome (98122189).

It can be divided in two parts, 201110 and 87, that multiplied together give a triangular number (17496570 = T₅₉₁₅).

The spelling of 20111087 in words is "twenty million, one hundred eleven thousand, eighty-seven".