20178395136 has 112 divisors (see below), whose sum is σ = 59784843600. Its totient is φ = 6726057984.

The previous prime is 20178395131. The next prime is 20178395173. The reversal of 20178395136 is 63159387102.

It is a junction number, because it is equal to n+sod(n) for n = 20178395091 and 20178395100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20178395131) 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 7 ways as a sum of consecutive naturals, for example, 175570 + ... + 266798.

Almost surely, 2^20178395136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20178395136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29892421800).

20178395136 is an abundant number, since it is smaller than the sum of its proper divisors (39606448464).

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

20178395136 is an frugal number, since it uses more digits than its factorization.

20178395136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91264 (or 91234 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The spelling of 20178395136 in words is "twenty billion, one hundred seventy-eight million, three hundred ninety-five thousand, one hundred thirty-six".