20399636886 has 12 divisors (see below), whose sum is σ = 40799973492. Its totient is φ = 6799762344.

The previous prime is 20399636849. The next prime is 20399636909. The reversal of 20399636886 is 68863699302.

It is a super-2 number, since 2×20399636886² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 320700 + ... + 379008.

It is an arithmetic number, because the mean of its divisors is an integer number (3399997791).

Almost surely, 2^20399636886 is an apocalyptic number.

20399636886 is an abundant number, since it is smaller than the sum of its proper divisors (20400336606).

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

20399636886 is an frugal number, since it uses more digits than its factorization.

20399636886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116623 (or 58314 counting only the distinct ones).

The product of its (nonzero) digits is 20155392, while the sum is 60.

The spelling of 20399636886 in words is "twenty billion, three hundred ninety-nine million, six hundred thirty-six thousand, eight hundred eighty-six".