20108285 has 4 divisors (see below), whose sum is σ = 24129948. Its totient is φ = 16086624.

The previous prime is 20108227. The next prime is 20108287. The reversal of 20108285 is 58280102.

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 13853284 + 6255001 = 3722^2 + 2501^2 .

It is a cyclic number.

It is not a de Polignac number, because 20108285 - 2⁸ = 20108029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20108287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2010824 + ... + 2010833.

It is an arithmetic number, because the mean of its divisors is an integer number (6032487).

Almost surely, 2^20108285 is an apocalyptic number.

It is an amenable number.

20108285 is a deficient number, since it is larger than the sum of its proper divisors (4021663).

20108285 is an equidigital number, since it uses as much as digits as its factorization.

20108285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4021662.

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 20108285 is about 4484.2262431773. The cubic root of 20108285 is about 271.9307647096.

Adding to 20108285 its reverse (58280102), we get a palindrome (78388387).

The spelling of 20108285 in words is "twenty million, one hundred eight thousand, two hundred eighty-five".