20849439945 has 32 divisors (see below), whose sum is σ = 34682976000. Its totient is φ = 10682267904.

The previous prime is 20849439913. The next prime is 20849439967. The reversal of 20849439945 is 54993494802.

It is not a de Polignac number, because 20849439945 - 2⁵ = 20849439913 is a prime.

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, 33862 + ... + 206991.

It is an arithmetic number, because the mean of its divisors is an integer number (1083843000).

Almost surely, 2^20849439945 is an apocalyptic number.

It is an amenable number.

20849439945 is a deficient number, since it is larger than the sum of its proper divisors (13833536055).

20849439945 is a wasteful number, since it uses less digits than its factorization.

20849439945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241089.

The product of its (nonzero) digits is 11197440, while the sum is 57.

The spelling of 20849439945 in words is "twenty billion, eight hundred forty-nine million, four hundred thirty-nine thousand, nine hundred forty-five".