20187017 has 4 divisors (see below), whose sum is σ = 20616576. Its totient is φ = 19757460.

The previous prime is 20186993. The next prime is 20187023. The reversal of 20187017 is 71078102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20187017 - 2⁶ = 20186953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20187317) 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, 214709 + ... + 214802.

It is an arithmetic number, because the mean of its divisors is an integer number (5154144).

Almost surely, 2^20187017 is an apocalyptic number.

It is an amenable number.

20187017 is a deficient number, since it is larger than the sum of its proper divisors (429559).

20187017 is an equidigital number, since it uses as much as digits as its factorization.

20187017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429558.

The product of its (nonzero) digits is 784, while the sum is 26.

The square root of 20187017 is about 4492.9964389036. The cubic root of 20187017 is about 272.2852085144.

The spelling of 20187017 in words is "twenty million, one hundred eighty-seven thousand, seventeen".