20318604438 has 64 divisors (see below), whose sum is σ = 45449558784. Its totient is φ = 6002112000.

The previous prime is 20318604421. The next prime is 20318604461. The reversal of 20318604438 is 83440681302.

It is a happy number.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 20318604396 and 20318604405.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 4654845 + ... + 4659207.

It is an arithmetic number, because the mean of its divisors is an integer number (710149356).

Almost surely, 2^20318604438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20318604438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22724779392).

20318604438 is an abundant number, since it is smaller than the sum of its proper divisors (25130954346).

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

20318604438 is a wasteful number, since it uses less digits than its factorization.

20318604438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6141.

The product of its (nonzero) digits is 110592, while the sum is 39.

The spelling of 20318604438 in words is "twenty billion, three hundred eighteen million, six hundred four thousand, four hundred thirty-eight".