20168400202217 has 4 divisors (see below), whose sum is σ = 20510237493840. Its totient is φ = 19826562910596.

The previous prime is 20168400202207. The next prime is 20168400202259. The reversal of 20168400202217 is 71220200486102.

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 20168400202217 - 2¹⁰ = 20168400201193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20168400202207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170918645723 + ... + 170918645840.

It is an arithmetic number, because the mean of its divisors is an integer number (5127559373460).

Almost surely, 2^{20168400202217} is an apocalyptic number.

It is an amenable number.

20168400202217 is a deficient number, since it is larger than the sum of its proper divisors (341837291623).

20168400202217 is an equidigital number, since it uses as much as digits as its factorization.

20168400202217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341837291622.

The product of its (nonzero) digits is 21504, while the sum is 35.

Adding to 20168400202217 its reverse (71220200486102), we get a palindrome (91388600688319).

The spelling of 20168400202217 in words is "twenty trillion, one hundred sixty-eight billion, four hundred million, two hundred two thousand, two hundred seventeen".