20017216867 has 4 divisors (see below), whose sum is σ = 20052397080. Its totient is φ = 19982036656.

The previous prime is 20017216859. The next prime is 20017216873. The reversal of 20017216867 is 76861271002.

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 20017216867 - 2³ = 20017216859 is a prime.

It is a super-2 number, since 2×20017216867² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20017216067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17589253 + ... + 17590390.

It is an arithmetic number, because the mean of its divisors is an integer number (5013099270).

Almost surely, 2^20017216867 is an apocalyptic number.

20017216867 is a deficient number, since it is larger than the sum of its proper divisors (35180213).

20017216867 is an equidigital number, since it uses as much as digits as its factorization.

20017216867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35180212.

The product of its (nonzero) digits is 56448, while the sum is 40.

Adding to 20017216867 its reverse (76861271002), we get a palindrome (96878487869).

The spelling of 20017216867 in words is "twenty billion, seventeen million, two hundred sixteen thousand, eight hundred sixty-seven".