20005538667 has 32 divisors (see below), whose sum is σ = 28824416256. Its totient is φ = 12305779200.

The previous prime is 20005538639. The next prime is 20005538671. The reversal of 20005538667 is 76683550002.

It is not a de Polignac number, because 20005538667 - 2⁸ = 20005538411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20005538167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 654567 + ... + 684447.

It is an arithmetic number, because the mean of its divisors is an integer number (900763008).

Almost surely, 2^20005538667 is an apocalyptic number.

20005538667 is a deficient number, since it is larger than the sum of its proper divisors (8818877589).

20005538667 is a wasteful number, since it uses less digits than its factorization.

20005538667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30251.

The product of its (nonzero) digits is 302400, while the sum is 42.

The spelling of 20005538667 in words is "twenty billion, five million, five hundred thirty-eight thousand, six hundred sixty-seven".