20686858912 has 48 divisors (see below), whose sum is σ = 43387414560. Its totient is φ = 9680954112.

The previous prime is 20686858891. The next prime is 20686858919. The reversal of 20686858912 is 21985868602.

It is a happy number.

It is a super-2 number, since 2×20686858912² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20686858919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154503 + ... + 255430.

It is an arithmetic number, because the mean of its divisors is an integer number (903904470).

Almost surely, 2^20686858912 is an apocalyptic number.

It is an amenable number.

20686858912 is an abundant number, since it is smaller than the sum of its proper divisors (22700555648).

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

20686858912 is a wasteful number, since it uses less digits than its factorization.

20686858912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410045 (or 410037 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 55.

The spelling of 20686858912 in words is "twenty billion, six hundred eighty-six million, eight hundred fifty-eight thousand, nine hundred twelve".