20799856 has 40 divisors (see below), whose sum is σ = 50246784. Its totient is φ = 8103360.

The previous prime is 20799847. The next prime is 20799869. The reversal of 20799856 is 65899702.

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, 7210 + ... + 9673.

Almost surely, 2^20799856 is an apocalyptic number.

It is an amenable number.

20799856 is an abundant number, since it is smaller than the sum of its proper divisors (29446928).

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

20799856 is a wasteful number, since it uses less digits than its factorization.

20799856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16909 (or 16903 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 20799856 is about 4560.6859133249. The cubic root of 20799856 is about 275.0131387662.

It can be divided in two parts, 2079 and 9856, that added together give a triangular number (11935 = T₁₅₄).

The spelling of 20799856 in words is "twenty million, seven hundred ninety-nine thousand, eight hundred fifty-six".