20005163506205 has 8 divisors (see below), whose sum is σ = 24013677123000. Its totient is φ = 15999143527936.

The previous prime is 20005163506177. The next prime is 20005163506243. The reversal of 20005163506205 is 50260536150002.

It can be written as a sum of positive squares in 4 ways, for example, as 3089365160281 + 16915798345924 = 1757659^2 + 4112882^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20005163506205 - 2²⁴ = 20005146728989 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 623391980 + ... + 623424069.

It is an arithmetic number, because the mean of its divisors is an integer number (3001709640375).

Almost surely, 2^{20005163506205} is an apocalyptic number.

It is an amenable number.

20005163506205 is a deficient number, since it is larger than the sum of its proper divisors (4008513616795).

20005163506205 is a wasteful number, since it uses less digits than its factorization.

20005163506205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1246819263.

The product of its (nonzero) digits is 54000, while the sum is 35.

Adding to 20005163506205 its reverse (50260536150002), we get a palindrome (70265699656207).

The spelling of 20005163506205 in words is "twenty trillion, five billion, one hundred sixty-three million, five hundred six thousand, two hundred five".