20310856 has 16 divisors (see below), whose sum is σ = 38384640. Its totient is φ = 10074960.

The previous prime is 20310841. The next prime is 20310877. The reversal of 20310856 is 65801302.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20310856.

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 3 ways as a sum of consecutive naturals, for example, 8980 + ... + 11011.

It is an arithmetic number, because the mean of its divisors is an integer number (2399040).

Almost surely, 2^20310856 is an apocalyptic number.

It is an amenable number.

20310856 is a deficient number, since it is larger than the sum of its proper divisors (18073784).

20310856 is a wasteful number, since it uses less digits than its factorization.

20310856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20124 (or 20120 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 20310856 is about 4506.7567052150. The cubic root of 20310856 is about 272.8408595414.

The spelling of 20310856 in words is "twenty million, three hundred ten thousand, eight hundred fifty-six".