20001109 has 4 divisors (see below), whose sum is σ = 20207404. Its totient is φ = 19794816.

The previous prime is 20001083. The next prime is 20001139. The reversal of 20001109 is 90110002.

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 16402500 + 3598609 = 4050^2 + 1897^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001109 - 2²³ = 11612501 is a prime.

It is a super-2 number, since 2×20001109² = 800088722459762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103002 + ... + 103195.

It is an arithmetic number, because the mean of its divisors is an integer number (5051851).

Almost surely, 2^20001109 is an apocalyptic number.

It is an amenable number.

20001109 is a deficient number, since it is larger than the sum of its proper divisors (206295).

20001109 is an equidigital number, since it uses as much as digits as its factorization.

20001109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206294.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 20001109 is about 4472.2599432502. The cubic root of 20001109 is about 271.4467787153.

The spelling of 20001109 in words is "twenty million, one thousand, one hundred nine".