20846045668009 has 9 divisors (see below), whose sum is σ = 21100612419543. Its totient is φ = 20594514100032.

The previous prime is 20846045668001. The next prime is 20846045668039. The reversal of 20846045668009 is 90086654064802.

The square root of 20846045668009 is 4565747.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 16512820578409 + 4333225089600 = 4063597^2 + 2081640^2 .

It is not a de Polignac number, because 20846045668009 - 2³ = 20846045668001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20846045668001) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 378929497 + ... + 378984505.

Almost surely, 2^{20846045668009} is an apocalyptic number.

20846045668009 is the 4565747-th square number.

20846045668009 is the 2282874-th centered octagonal number.

It is an amenable number.

20846045668009 is a deficient number, since it is larger than the sum of its proper divisors (254566751534).

20846045668009 is an frugal number, since it uses more digits than its factorization.

20846045668009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110184 (or 55092 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 58.

The spelling of 20846045668009 in words is "twenty trillion, eight hundred forty-six billion, forty-five million, six hundred sixty-eight thousand, nine".