20503157166 has 48 divisors (see below), whose sum is σ = 45301273056. Its totient is φ = 6699571008.

The previous prime is 20503157161. The next prime is 20503157221. The reversal of 20503157166 is 66175130502.

20503157166 is a `hidden beast` number, since 2 + 0 + 50 + 31 + 571 + 6 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 20503157166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20503157161) 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 23 ways as a sum of consecutive naturals, for example, 1157956 + ... + 1175528.

It is an arithmetic number, because the mean of its divisors is an integer number (943776522).

Almost surely, 2^20503157166 is an apocalyptic number.

20503157166 is an abundant number, since it is smaller than the sum of its proper divisors (24798115890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20503157166 is a wasteful number, since it uses less digits than its factorization.

20503157166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18857 (or 18854 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

Adding to 20503157166 its reverse (66175130502), we get a palindrome (86678287668).

The spelling of 20503157166 in words is "twenty billion, five hundred three million, one hundred fifty-seven thousand, one hundred sixty-six".