20500256163 has 8 divisors (see below), whose sum is σ = 27337708288. Its totient is φ = 13664820744.

The previous prime is 20500256143. The next prime is 20500256167. The reversal of 20500256163 is 36165200502.

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

It is not a de Polignac number, because 20500256163 - 2²⁹ = 19963385251 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20500256163.

It is not an unprimeable number, because it can be changed into a prime (20500256167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 480295 + ... + 521232.

It is an arithmetic number, because the mean of its divisors is an integer number (3417213536).

Almost surely, 2^20500256163 is an apocalyptic number.

20500256163 is a deficient number, since it is larger than the sum of its proper divisors (6837452125).

20500256163 is a wasteful number, since it uses less digits than its factorization.

20500256163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1008353.

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 20500256163 its reverse (36165200502), we get a palindrome (56665456665).

The spelling of 20500256163 in words is "twenty billion, five hundred million, two hundred fifty-six thousand, one hundred sixty-three".