20581082168 has 32 divisors (see below), whose sum is σ = 39686254560. Its totient is φ = 9998835840.

The previous prime is 20581082167. The next prime is 20581082183. The reversal of 20581082168 is 86128018502.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20581082167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173138 + ... + 266718.

It is an arithmetic number, because the mean of its divisors is an integer number (1240195455).

Almost surely, 2^20581082168 is an apocalyptic number.

It is an amenable number.

20581082168 is a deficient number, since it is larger than the sum of its proper divisors (19105172392).

20581082168 is a wasteful number, since it uses less digits than its factorization.

20581082168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94367 (or 94363 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 41.

The spelling of 20581082168 in words is "twenty billion, five hundred eighty-one million, eighty-two thousand, one hundred sixty-eight".