20845380980205 has 32 divisors (see below), whose sum is σ = 37059122419200. Its totient is φ = 11117336319936.

The previous prime is 20845380980147. The next prime is 20845380980239. The reversal of 20845380980205 is 50208908354802.

It is a happy number.

20845380980205 is a `hidden beast` number, since 2 + 0 + 8 + 4 + 538 + 0 + 9 + 80 + 20 + 5 = 666.

It is not a de Polignac number, because 20845380980205 - 2¹² = 20845380976109 is a prime.

It is a congruent number.

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, 6290791 + ... + 9014699.

It is an arithmetic number, because the mean of its divisors is an integer number (1158097575600).

Almost surely, 2^{20845380980205} is an apocalyptic number.

It is an amenable number.

20845380980205 is a deficient number, since it is larger than the sum of its proper divisors (16213741438995).

20845380980205 is a wasteful number, since it uses less digits than its factorization.

20845380980205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2780610 (or 2780604 counting only the distinct ones).

The product of its (nonzero) digits is 5529600, while the sum is 54.

The spelling of 20845380980205 in words is "twenty trillion, eight hundred forty-five billion, three hundred eighty million, nine hundred eighty thousand, two hundred five".