20000181638004 has 144 divisors (see below), whose sum is σ = 48876217143936. Its totient is φ = 6361551820800.

The previous prime is 20000181637993. The next prime is 20000181638009. The reversal of 20000181638004 is 40083618100002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000181638009) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1937809164 + ... + 1937819484.

Almost surely, 2^{20000181638004} is an apocalyptic number.

It is an amenable number.

20000181638004 is an abundant number, since it is smaller than the sum of its proper divisors (28876035505932).

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

20000181638004 is a wasteful number, since it uses less digits than its factorization.

20000181638004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12246 (or 12197 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

Adding to 20000181638004 its reverse (40083618100002), we get a palindrome (60083799738006).

The spelling of 20000181638004 in words is "twenty trillion, one hundred eighty-one million, six hundred thirty-eight thousand, four".