20581108 has 12 divisors (see below), whose sum is σ = 36049860. Its totient is φ = 10281152.

The previous prime is 20581103. The next prime is 20581153. The reversal of 20581108 is 80118502.

It can be written as a sum of positive squares in 2 ways, for example, as 3175524 + 17405584 = 1782^2 + 4172^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20581103) 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, 5448 + ... + 8416.

It is an arithmetic number, because the mean of its divisors is an integer number (3004155).

Almost surely, 2^20581108 is an apocalyptic number.

It is an amenable number.

20581108 is a deficient number, since it is larger than the sum of its proper divisors (15468752).

20581108 is a wasteful number, since it uses less digits than its factorization.

20581108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4706 (or 4704 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 20581108 is about 4536.6406073217. The cubic root of 20581108 is about 274.0456527906.

The spelling of 20581108 in words is "twenty million, five hundred eighty-one thousand, one hundred eight".