20806803 has 24 divisors (see below), whose sum is σ = 31122000. Its totient is φ = 13386240.

The previous prime is 20806801. The next prime is 20806817. The reversal of 20806803 is 30860802.

It is not a de Polignac number, because 20806803 - 2¹ = 20806801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20806801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41448 + ... + 41946.

It is an arithmetic number, because the mean of its divisors is an integer number (1296750).

Almost surely, 2^20806803 is an apocalyptic number.

20806803 is a deficient number, since it is larger than the sum of its proper divisors (10315197).

20806803 is a wasteful number, since it uses less digits than its factorization.

20806803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659 (or 656 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 20806803 is about 4561.4474676357. The cubic root of 20806803 is about 275.0437528181.

It can be divided in two parts, 20806 and 803, that added together give a square (21609 = 147²).

The spelling of 20806803 in words is "twenty million, eight hundred six thousand, eight hundred three".