20005087 has 2 divisors, whose sum is σ = 20005088. Its totient is φ = 20005086.

The previous prime is 20005021. The next prime is 20005093. The reversal of 20005087 is 78050002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20005087 - 2¹⁵ = 19972319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20006087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10002543 + 10002544.

It is an arithmetic number, because the mean of its divisors is an integer number (10002544).

Almost surely, 2^20005087 is an apocalyptic number.

20005087 is a deficient number, since it is larger than the sum of its proper divisors (1).

20005087 is an equidigital number, since it uses as much as digits as its factorization.

20005087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 20005087 is about 4472.7046627293. The cubic root of 20005087 is about 271.4647734459.

Adding to 20005087 its reverse (78050002), we get a palindrome (98055089).

The spelling of 20005087 in words is "twenty million, five thousand, eighty-seven".