20108811 has 8 divisors (see below), whose sum is σ = 26856144. Its totient is φ = 13383680.

The previous prime is 20108789. The next prime is 20108813. The reversal of 20108811 is 11880102.

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 20108811 - 2⁶ = 20108747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20108813) 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, 3306 + ... + 7151.

It is an arithmetic number, because the mean of its divisors is an integer number (3357018).

Almost surely, 2^20108811 is an apocalyptic number.

20108811 is a deficient number, since it is larger than the sum of its proper divisors (6747333).

20108811 is a wasteful number, since it uses less digits than its factorization.

20108811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11101.

The product of its (nonzero) digits is 128, while the sum is 21.

The square root of 20108811 is about 4484.2848928229. The cubic root of 20108811 is about 271.9331357776.

Adding to 20108811 its reverse (11880102), we get a palindrome (31988913).

The spelling of 20108811 in words is "twenty million, one hundred eight thousand, eight hundred eleven".