20285687 has 8 divisors (see below), whose sum is σ = 20992512. Its totient is φ = 19582200.

The previous prime is 20285677. The next prime is 20285719. The reversal of 20285687 is 78658202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20285687 - 2⁸ = 20285431 is a prime.

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 20285687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20285627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20948 + ... + 21894.

It is an arithmetic number, because the mean of its divisors is an integer number (2624064).

Almost surely, 2^20285687 is an apocalyptic number.

20285687 is a deficient number, since it is larger than the sum of its proper divisors (706825).

20285687 is an equidigital number, since it uses as much as digits as its factorization.

20285687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1669.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 20285687 is about 4503.9634767613. The cubic root of 20285687 is about 272.7281124452.

The spelling of 20285687 in words is "twenty million, two hundred eighty-five thousand, six hundred eighty-seven".