20180444778 has 24 divisors (see below), whose sum is σ = 47087705028. Its totient is φ = 6209367552.

The previous prime is 20180444761. The next prime is 20180444797. The reversal of 20180444778 is 87744408102.

20180444778 is a `hidden beast` number, since 20 + 180 + 4 + 447 + 7 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19687737969 + 492706809 = 140313^2 + 22197^2 .

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 43120375 + ... + 43120842.

Almost surely, 2^20180444778 is an apocalyptic number.

20180444778 is an abundant number, since it is smaller than the sum of its proper divisors (26907260250).

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

20180444778 is a wasteful number, since it uses less digits than its factorization.

20180444778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86241238 (or 86241235 counting only the distinct ones).

The product of its (nonzero) digits is 401408, while the sum is 45.

The spelling of 20180444778 in words is "twenty billion, one hundred eighty million, four hundred forty-four thousand, seven hundred seventy-eight".