20710805 has 4 divisors (see below), whose sum is σ = 24852972. Its totient is φ = 16568640.

The previous prime is 20710793. The next prime is 20710831. The reversal of 20710805 is 50801702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5202961 + 15507844 = 2281^2 + 3938^2 .

It is not a de Polignac number, because 20710805 - 2⁸ = 20710549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2071076 + ... + 2071085.

It is an arithmetic number, because the mean of its divisors is an integer number (6213243).

Almost surely, 2^20710805 is an apocalyptic number.

It is an amenable number.

20710805 is a deficient number, since it is larger than the sum of its proper divisors (4142167).

20710805 is an equidigital number, since it uses as much as digits as its factorization.

20710805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4142166.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 20710805 is about 4550.9125458528. The cubic root of 20710805 is about 274.6201035360.

The spelling of 20710805 in words is "twenty million, seven hundred ten thousand, eight hundred five".