20956471585 has 8 divisors (see below), whose sum is σ = 28740303936. Its totient is φ = 14370151920.

The previous prime is 20956471577. The next prime is 20956471589. The reversal of 20956471585 is 58517465902.

It is a happy number.

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

It is not a de Polignac number, because 20956471585 - 2³ = 20956471577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20956471589) by changing a digit.

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, 299378131 + ... + 299378200.

It is an arithmetic number, because the mean of its divisors is an integer number (3592537992).

Almost surely, 2^20956471585 is an apocalyptic number.

It is an amenable number.

20956471585 is a deficient number, since it is larger than the sum of its proper divisors (7783832351).

20956471585 is an equidigital number, since it uses as much as digits as its factorization.

20956471585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598756343.

The product of its (nonzero) digits is 3024000, while the sum is 52.

The spelling of 20956471585 in words is "twenty billion, nine hundred fifty-six million, four hundred seventy-one thousand, five hundred eighty-five".