20550138078 has 32 divisors (see below), whose sum is σ = 41275092384. Its totient is φ = 6820958592.

The previous prime is 20550138071. The next prime is 20550138113. The reversal of 20550138078 is 87083105502.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20550138071) 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 15 ways as a sum of consecutive naturals, for example, 1890876 + ... + 1901712.

It is an arithmetic number, because the mean of its divisors is an integer number (1289846637).

Almost surely, 2^20550138078 is an apocalyptic number.

20550138078 is an abundant number, since it is smaller than the sum of its proper divisors (20724954306).

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

20550138078 is a wasteful number, since it uses less digits than its factorization.

20550138078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12156.

The product of its (nonzero) digits is 67200, while the sum is 39.

The spelling of 20550138078 in words is "twenty billion, five hundred fifty million, one hundred thirty-eight thousand, seventy-eight".