20906065896 has 128 divisors (see below), whose sum is σ = 56203459200. Its totient is φ = 6467005440.

The previous prime is 20906065853. The next prime is 20906065909. The reversal of 20906065896 is 69856060902.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2132526 + ... + 2142306.

It is an arithmetic number, because the mean of its divisors is an integer number (439089525).

Almost surely, 2^20906065896 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20906065896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28101729600).

20906065896 is an abundant number, since it is smaller than the sum of its proper divisors (35297393304).

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

20906065896 is a wasteful number, since it uses less digits than its factorization.

20906065896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9939 (or 9935 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 51.

The spelling of 20906065896 in words is "twenty billion, nine hundred six million, sixty-five thousand, eight hundred ninety-six".