20778584167 has 16 divisors (see below), whose sum is σ = 23917622400. Its totient is φ = 17852646240.

The previous prime is 20778584153. The next prime is 20778584171. The reversal of 20778584167 is 76148587702.

It is not a de Polignac number, because 20778584167 - 2¹¹ = 20778582119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20778584867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31068 + ... + 206209.

It is an arithmetic number, because the mean of its divisors is an integer number (1494851400).

Almost surely, 2^20778584167 is an apocalyptic number.

20778584167 is a deficient number, since it is larger than the sum of its proper divisors (3139038233).

20778584167 is a wasteful number, since it uses less digits than its factorization.

20778584167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237726.

The product of its (nonzero) digits is 5268480, while the sum is 55.

The spelling of 20778584167 in words is "twenty billion, seven hundred seventy-eight million, five hundred eighty-four thousand, one hundred sixty-seven".