20845751089 has 8 divisors (see below), whose sum is σ = 20999302632. Its totient is φ = 20692669440.

The previous prime is 20845751077. The next prime is 20845751131. The reversal of 20845751089 is 98015754802.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3920400 + 20841830689 = 1980^2 + 144367^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20845751089 - 2²¹ = 20843653937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20845751189) 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, 28174 + ... + 206119.

It is an arithmetic number, because the mean of its divisors is an integer number (2624912829).

Almost surely, 2^20845751089 is an apocalyptic number.

It is an amenable number.

20845751089 is a deficient number, since it is larger than the sum of its proper divisors (153551543).

20845751089 is a wasteful number, since it uses less digits than its factorization.

20845751089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234947.

The product of its (nonzero) digits is 806400, while the sum is 49.

The spelling of 20845751089 in words is "twenty billion, eight hundred forty-five million, seven hundred fifty-one thousand, eighty-nine".