20806484 has 6 divisors (see below), whose sum is σ = 36411354. Its totient is φ = 10403240.

The previous prime is 20806459. The next prime is 20806507. The reversal of 20806484 is 48460802.

It can be written as a sum of positive squares in only one way, i.e., 18490000 + 2316484 = 4300^2 + 1522^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20806484.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2600807 + ... + 2600814.

It is an arithmetic number, because the mean of its divisors is an integer number (6068559).

Almost surely, 2^20806484 is an apocalyptic number.

It is an amenable number.

20806484 is a deficient number, since it is larger than the sum of its proper divisors (15604870).

20806484 is a wasteful number, since it uses less digits than its factorization.

20806484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5201625 (or 5201623 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 20806484 is about 4561.4125005309. The cubic root of 20806484 is about 275.0423471976.

The spelling of 20806484 in words is "twenty million, eight hundred six thousand, four hundred eighty-four".