20814685 has 4 divisors (see below), whose sum is σ = 24977628. Its totient is φ = 16651744.

The previous prime is 20814679. The next prime is 20814691. The reversal of 20814685 is 58641802.

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

It is an interprime number because it is at equal distance from previous prime (20814679) and next prime (20814691).

It can be written as a sum of positive squares in 2 ways, for example, as 3790809 + 17023876 = 1947^2 + 4126^2 .

It is a cyclic number.

It is not a de Polignac number, because 20814685 - 2⁵ = 20814653 is a prime.

It is a super-2 number, since 2×20814685² = 866502223298450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20814685.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2081464 + ... + 2081473.

It is an arithmetic number, because the mean of its divisors is an integer number (6244407).

Almost surely, 2^20814685 is an apocalyptic number.

It is an amenable number.

20814685 is a deficient number, since it is larger than the sum of its proper divisors (4162943).

20814685 is an equidigital number, since it uses as much as digits as its factorization.

20814685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4162942.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 20814685 is about 4562.3113659635. The cubic root of 20814685 is about 275.0784789791.

The spelling of 20814685 in words is "twenty million, eight hundred fourteen thousand, six hundred eighty-five".