20681980158 has 32 divisors (see below), whose sum is σ = 47309670144. Its totient is φ = 5904565632.

The previous prime is 20681980127. The next prime is 20681980211. The reversal of 20681980158 is 85108918602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135360 + ... + 244307.

It is an arithmetic number, because the mean of its divisors is an integer number (1478427192).

Almost surely, 2^20681980158 is an apocalyptic number.

20681980158 is an abundant number, since it is smaller than the sum of its proper divisors (26627689986).

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

20681980158 is a wasteful number, since it uses less digits than its factorization.

20681980158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380976.

The product of its (nonzero) digits is 276480, while the sum is 48.

The spelling of 20681980158 in words is "twenty billion, six hundred eighty-one million, nine hundred eighty thousand, one hundred fifty-eight".