20439521545 has 8 divisors (see below), whose sum is σ = 24529175424. Its totient is φ = 16350450864.

The previous prime is 20439521507. The next prime is 20439521561. The reversal of 20439521545 is 54512593402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20439521545 - 2⁹ = 20439521033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20439521498 and 20439521507.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64579 + ... + 212248.

It is an arithmetic number, because the mean of its divisors is an integer number (3066146928).

Almost surely, 2^20439521545 is an apocalyptic number.

It is an amenable number.

20439521545 is a deficient number, since it is larger than the sum of its proper divisors (4089653879).

20439521545 is a wasteful number, since it uses less digits than its factorization.

20439521545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291599.

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 20439521545 in words is "twenty billion, four hundred thirty-nine million, five hundred twenty-one thousand, five hundred forty-five".