20682685 has 4 divisors (see below), whose sum is σ = 24819228. Its totient is φ = 16546144.

The previous prime is 20682677. The next prime is 20682719. The reversal of 20682685 is 58628602.

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 13823524 + 6859161 = 3718^2 + 2619^2 .

It is a cyclic number.

It is not a de Polignac number, because 20682685 - 2³ = 20682677 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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2068264 + ... + 2068273.

It is an arithmetic number, because the mean of its divisors is an integer number (6204807).

Almost surely, 2^20682685 is an apocalyptic number.

It is an amenable number.

20682685 is a deficient number, since it is larger than the sum of its proper divisors (4136543).

20682685 is an equidigital number, since it uses as much as digits as its factorization.

20682685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4136542.

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 20682685 is about 4547.8220061915. The cubic root of 20682685 is about 274.4957591832.

It can be divided in two parts, 2068 and 2685, that added together give a triangular number (4753 = T₉₇).

The spelling of 20682685 in words is "twenty million, six hundred eighty-two thousand, six hundred eighty-five".