20856805324 has 18 divisors (see below), whose sum is σ = 38521539924. Its totient is φ = 9879538680.

The previous prime is 20856805309. The next prime is 20856805327. The reversal of 20856805324 is 42350865802.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20856805327) 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 5 ways as a sum of consecutive naturals, for example, 7220442 + ... + 7223329.

Almost surely, 2^20856805324 is an apocalyptic number.

It is an amenable number.

20856805324 is a deficient number, since it is larger than the sum of its proper divisors (17664734600).

20856805324 is a wasteful number, since it uses less digits than its factorization.

20856805324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14443813 (or 14443792 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 43.

The spelling of 20856805324 in words is "twenty billion, eight hundred fifty-six million, eight hundred five thousand, three hundred twenty-four".