20686711 has 4 divisors (see below), whose sum is σ = 20697912. Its totient is φ = 20675512.

The previous prime is 20686709. The next prime is 20686723. The reversal of 20686711 is 11768602.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20686711 - 2¹ = 20686709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20686751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2101 + ... + 6766.

It is an arithmetic number, because the mean of its divisors is an integer number (5174478).

Almost surely, 2^20686711 is an apocalyptic number.

20686711 is a deficient number, since it is larger than the sum of its proper divisors (11201).

20686711 is an equidigital number, since it uses as much as digits as its factorization.

20686711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11200.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 20686711 is about 4548.2646141138. The cubic root of 20686711 is about 274.5135687379.

The spelling of 20686711 in words is "twenty million, six hundred eighty-six thousand, seven hundred eleven".