20826000645 has 16 divisors (see below), whose sum is σ = 33323467392. Its totient is φ = 11106578240.

The previous prime is 20826000607. The next prime is 20826000649. The reversal of 20826000645 is 54600062802.

It is not a de Polignac number, because 20826000645 - 2²³ = 20817612037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20826000649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 391600 + ... + 441590.

It is an arithmetic number, because the mean of its divisors is an integer number (2082716712).

Almost surely, 2^20826000645 is an apocalyptic number.

20826000645 is the 83319-th octagonal number.

It is an amenable number.

20826000645 is a deficient number, since it is larger than the sum of its proper divisors (12497466747).

20826000645 is a wasteful number, since it uses less digits than its factorization.

20826000645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77772.

The product of its (nonzero) digits is 23040, while the sum is 33.

The spelling of 20826000645 in words is "twenty billion, eight hundred twenty-six million, six hundred forty-five", and thus it is an aban number.