20956606080 has 64 divisors (see below), whose sum is σ = 66799188000. Its totient is φ = 5588427776.

The previous prime is 20956606079. The next prime is 20956606091. The reversal of 20956606080 is 8060665902.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5455530 + ... + 5459369.

Almost surely, 2^20956606080 is an apocalyptic number.

20956606080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20956606080 is an abundant number, since it is smaller than the sum of its proper divisors (45842581920).

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

20956606080 is a wasteful number, since it uses less digits than its factorization.

20956606080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10914921 (or 10914909 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 20956606080 in words is "twenty billion, nine hundred fifty-six million, six hundred six thousand, eighty".