20717217227 has 4 divisors (see below), whose sum is σ = 23676819696. Its totient is φ = 17757614760.

The previous prime is 20717217197. The next prime is 20717217247. The reversal of 20717217227 is 72271271702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20717217227 - 2²⁶ = 20650108363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20717217247) 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, 1479801224 + ... + 1479801237.

It is an arithmetic number, because the mean of its divisors is an integer number (5919204924).

Almost surely, 2^20717217227 is an apocalyptic number.

20717217227 is a deficient number, since it is larger than the sum of its proper divisors (2959602469).

20717217227 is an equidigital number, since it uses as much as digits as its factorization.

20717217227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2959602468.

The product of its (nonzero) digits is 38416, while the sum is 38.

Adding to 20717217227 its reverse (72271271702), we get a palindrome (92988488929).

The spelling of 20717217227 in words is "twenty billion, seven hundred seventeen million, two hundred seventeen thousand, two hundred twenty-seven".