20845381329 has 12 divisors (see below), whose sum is σ = 30402326656. Its totient is φ = 13761998712.

The previous prime is 20845381309. The next prime is 20845381339. The reversal of 20845381329 is 92318354802.

20845381329 is a `hidden beast` number, since 2 + 0 + 84 + 538 + 1 + 32 + 9 = 666.

It is not a de Polignac number, because 20845381329 - 2⁹ = 20845380817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20845381309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11242537 + ... + 11244390.

Almost surely, 2^20845381329 is an apocalyptic number.

It is an amenable number.

20845381329 is a deficient number, since it is larger than the sum of its proper divisors (9556945327).

20845381329 is a wasteful number, since it uses less digits than its factorization.

20845381329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22487036 (or 22487033 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 20845381329 in words is "twenty billion, eight hundred forty-five million, three hundred eighty-one thousand, three hundred twenty-nine".