20110001 has 4 divisors (see below), whose sum is σ = 20120100. Its totient is φ = 20099904.

The previous prime is 20109989. The next prime is 20110043. The reversal of 20110001 is 10001102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 10001102 = 2 ⋅5000551.

It can be written as a sum of positive squares in 2 ways, for example, as 19009600 + 1100401 = 4360^2 + 1049^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20110001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20110301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 956 + ... + 6413.

It is an arithmetic number, because the mean of its divisors is an integer number (5030025).

Almost surely, 2^20110001 is an apocalyptic number.

It is an amenable number.

20110001 is a deficient number, since it is larger than the sum of its proper divisors (10099).

20110001 is an equidigital number, since it uses as much as digits as its factorization.

20110001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10098.

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 20110001 is about 4484.4175764529. The cubic root of 20110001 is about 271.9384998283.

Adding to 20110001 its reverse (10001102), we get a palindrome (30111103).

Multiplying 20110001 by its reverse (10001102), we get a palindrome (201122171221102).

The spelling of 20110001 in words is "twenty million, one hundred ten thousand, one".