20591339945 has 32 divisors (see below), whose sum is σ = 28105297920. Its totient is φ = 14345130240.

The previous prime is 20591339921. The next prime is 20591339959. The reversal of 20591339945 is 54993319502.

It is not a de Polignac number, because 20591339945 - 2¹⁴ = 20591323561 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20591339893 and 20591339902.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 151739 + ... + 253391.

It is an arithmetic number, because the mean of its divisors is an integer number (878290560).

Almost surely, 2^20591339945 is an apocalyptic number.

It is an amenable number.

20591339945 is a deficient number, since it is larger than the sum of its proper divisors (7513957975).

20591339945 is a wasteful number, since it uses less digits than its factorization.

20591339945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101825.

The product of its (nonzero) digits is 1312200, while the sum is 50.

The spelling of 20591339945 in words is "twenty billion, five hundred ninety-one million, three hundred thirty-nine thousand, nine hundred forty-five".