20856085 has 8 divisors (see below), whose sum is σ = 25637976. Its totient is φ = 16277760.

The previous prime is 20856061. The next prime is 20856089. The reversal of 20856085 is 58065802.

It can be written as a sum of positive squares in 4 ways, for example, as 552049 + 20304036 = 743^2 + 4506^2 .

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

It is not a de Polignac number, because 20856085 - 2¹⁷ = 20725013 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 20856085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20856089) 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, 50664 + ... + 51073.

It is an arithmetic number, because the mean of its divisors is an integer number (3204747).

Almost surely, 2^20856085 is an apocalyptic number.

It is an amenable number.

20856085 is a deficient number, since it is larger than the sum of its proper divisors (4781891).

20856085 is a wasteful number, since it uses less digits than its factorization.

20856085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101783.

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 20856085 is about 4566.8462860053. The cubic root of 20856085 is about 275.2607334311.

The spelling of 20856085 in words is "twenty million, eight hundred fifty-six thousand, eighty-five".