20667626656 has 24 divisors (see below), whose sum is σ = 42830938080. Its totient is φ = 9789928128.

The previous prime is 20667626641. The next prime is 20667626657. The reversal of 20667626656 is 65662676602.

It is not an unprimeable number, because it can be changed into a prime (20667626657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16995796 + ... + 16997011.

It is an arithmetic number, because the mean of its divisors is an integer number (1784622420).

Almost surely, 2^20667626656 is an apocalyptic number.

It is an amenable number.

20667626656 is an abundant number, since it is smaller than the sum of its proper divisors (22163311424).

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

20667626656 is a wasteful number, since it uses less digits than its factorization.

20667626656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33992836 (or 33992828 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 52.

It can be divided in two parts, 206676 and 26656, that added together give a palindrome (233332).

The spelling of 20667626656 in words is "twenty billion, six hundred sixty-seven million, six hundred twenty-six thousand, six hundred fifty-six".