20508085 has 16 divisors (see below), whose sum is σ = 27007344. Its totient is φ = 14856192.

The previous prime is 20508083. The next prime is 20508113. The reversal of 20508085 is 58080502.

It can be written as a sum of positive squares in 8 ways, for example, as 4691556 + 15816529 = 2166^2 + 3977^2 .

It is not a de Polignac number, because 20508085 - 2¹ = 20508083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20508083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 469 + ... + 6421.

It is an arithmetic number, because the mean of its divisors is an integer number (1687959).

Almost surely, 2^20508085 is an apocalyptic number.

It is an amenable number.

20508085 is a deficient number, since it is larger than the sum of its proper divisors (6499259).

20508085 is a wasteful number, since it uses less digits than its factorization.

20508085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6024.

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 20508085 is about 4528.5853199426. The cubic root of 20508085 is about 273.7211585997.

Adding to 20508085 its reverse (58080502), we get a palindrome (78588587).

The spelling of 20508085 in words is "twenty million, five hundred eight thousand, eighty-five".