20818186038 has 96 divisors (see below), whose sum is σ = 51184224000. Its totient is φ = 6062309568.

The previous prime is 20818186031. The next prime is 20818186061. The reversal of 20818186038 is 83068181802.

20818186038 is a `hidden beast` number, since 20 + 8 + 1 + 8 + 18 + 603 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 20818185984 and 20818186002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20818186031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6218281 + ... + 6221627.

It is an arithmetic number, because the mean of its divisors is an integer number (533169000).

Almost surely, 2^20818186038 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20818186038, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25592112000).

20818186038 is an abundant number, since it is smaller than the sum of its proper divisors (30366037962).

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

20818186038 is a wasteful number, since it uses less digits than its factorization.

20818186038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4786 (or 4783 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 45.

The spelling of 20818186038 in words is "twenty billion, eight hundred eighteen million, one hundred eighty-six thousand, thirty-eight".