20087017 has 4 divisors (see below), whose sum is σ = 20118996. Its totient is φ = 20055040.

The previous prime is 20086991. The next prime is 20087021. The reversal of 20087017 is 71078002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71078002 = 2 ⋅35539001.

It can be written as a sum of positive squares in 2 ways, for example, as 18696976 + 1390041 = 4324^2 + 1179^2 .

It is a cyclic number.

It is not a de Polignac number, because 20087017 - 2¹⁵ = 20054249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20086982 and 20087000.

It is not an unprimeable number, because it can be changed into a prime (20084017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15028 + ... + 16309.

It is an arithmetic number, because the mean of its divisors is an integer number (5029749).

Almost surely, 2^20087017 is an apocalyptic number.

It is an amenable number.

20087017 is a deficient number, since it is larger than the sum of its proper divisors (31979).

20087017 is an equidigital number, since it uses as much as digits as its factorization.

20087017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31978.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 20087017 is about 4481.8541921843. The cubic root of 20087017 is about 271.8348595691.

It can be divided in two parts, 2008 and 7017, that added together give a square (9025 = 95²).

The spelling of 20087017 in words is "twenty million, eighty-seven thousand, seventeen".