20118610728 has 24 divisors (see below), whose sum is σ = 54487904250. Its totient is φ = 6706203552.

The previous prime is 20118610723. The next prime is 20118610753. The reversal of 20118610728 is 82701681102.

20118610728 is a `hidden beast` number, since 2 + 0 + 1 + 18 + 610 + 7 + 28 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18457396164 + 1661214564 = 135858^2 + 40758^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20118610692 and 20118610701.

It is not an unprimeable number, because it can be changed into a prime (20118610723) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 139712503 + ... + 139712646.

Almost surely, 2^20118610728 is an apocalyptic number.

It is an amenable number.

20118610728 is an abundant number, since it is smaller than the sum of its proper divisors (34369293522).

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

20118610728 is a wasteful number, since it uses less digits than its factorization.

20118610728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279425161 (or 279425154 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The spelling of 20118610728 in words is "twenty billion, one hundred eighteen million, six hundred ten thousand, seven hundred twenty-eight".