20642000004 has 36 divisors (see below), whose sum is σ = 53588619084. Its totient is φ = 6694702272.

The previous prime is 20641999997. The next prime is 20642000009. The reversal of 20642000004 is 40000024602.

20642000004 is a `hidden beast` number, since 20 + 642 + 0 + 0 + 0 + 0 + 0 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19488718404 + 1153281600 = 139602^2 + 33960^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20642000009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7747167 + ... + 7749830.

Almost surely, 2^20642000004 is an apocalyptic number.

It is an amenable number.

20642000004 is an abundant number, since it is smaller than the sum of its proper divisors (32946619080).

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

20642000004 is a wasteful number, since it uses less digits than its factorization.

20642000004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15497044 (or 15497039 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 20642000004 its reverse (40000024602), we get a palindrome (60642024606).

The spelling of 20642000004 in words is "twenty billion, six hundred forty-two million, four", and thus it is an aban number.