20886965538 has 16 divisors (see below), whose sum is σ = 41971914336. Its totient is φ = 6929324640.

The previous prime is 20886965509. The next prime is 20886965543. The reversal of 20886965538 is 83556968802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8247931 + ... + 8250462.

It is an arithmetic number, because the mean of its divisors is an integer number (2623244646).

Almost surely, 2^20886965538 is an apocalyptic number.

20886965538 is an abundant number, since it is smaller than the sum of its proper divisors (21084948798).

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

20886965538 is a wasteful number, since it uses less digits than its factorization.

20886965538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16498609.

The product of its (nonzero) digits is 24883200, while the sum is 60.

The spelling of 20886965538 in words is "twenty billion, eight hundred eighty-six million, nine hundred sixty-five thousand, five hundred thirty-eight".