20000856 has 32 divisors (see below), whose sum is σ = 50342400. Its totient is φ = 6621600.

The previous prime is 20000843. The next prime is 20000861. The reversal of 20000856 is 65800002.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 865 + ... + 6383.

It is an arithmetic number, because the mean of its divisors is an integer number (1573200).

Almost surely, 2^20000856 is an apocalyptic number.

It is an amenable number.

20000856 is an abundant number, since it is smaller than the sum of its proper divisors (30341544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20000856 is a wasteful number, since it uses less digits than its factorization.

20000856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5679 (or 5675 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 20000856 is about 4472.2316576850. The cubic root of 20000856 is about 271.4456341734.

Adding to 20000856 its reverse (65800002), we get a palindrome (85800858).

The spelling of 20000856 in words is "twenty million, eight hundred fifty-six", and thus it is an aban number.