20017064217 has 4 divisors (see below), whose sum is σ = 26689418960. Its totient is φ = 13344709476.

The previous prime is 20017064213. The next prime is 20017064257. The reversal of 20017064217 is 71246071002.

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 not a de Polignac number, because 20017064217 - 2² = 20017064213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20017064213) 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, 3336177367 + ... + 3336177372.

It is an arithmetic number, because the mean of its divisors is an integer number (6672354740).

Almost surely, 2^20017064217 is an apocalyptic number.

It is an amenable number.

20017064217 is a deficient number, since it is larger than the sum of its proper divisors (6672354743).

20017064217 is an equidigital number, since it uses as much as digits as its factorization.

20017064217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6672354742.

The product of its (nonzero) digits is 4704, while the sum is 30.

The spelling of 20017064217 in words is "twenty billion, seventeen million, sixty-four thousand, two hundred seventeen".