20004111 has 8 divisors (see below), whose sum is σ = 29635760. Its totient is φ = 13336056.

The previous prime is 20004107. The next prime is 20004133. The reversal of 20004111 is 11140002.

It is a happy number.

It is not a de Polignac number, because 20004111 - 2² = 20004107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20004093 and 20004102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20004191) 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 7 ways as a sum of consecutive naturals, for example, 370420 + ... + 370473.

It is an arithmetic number, because the mean of its divisors is an integer number (3704470).

Almost surely, 2^20004111 is an apocalyptic number.

20004111 is a deficient number, since it is larger than the sum of its proper divisors (9631649).

20004111 is an equidigital number, since it uses as much as digits as its factorization.

20004111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740902 (or 740896 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 20004111 is about 4472.5955551559. The cubic root of 20004111 is about 271.4603586700.

Adding to 20004111 its reverse (11140002), we get a palindrome (31144113).

The spelling of 20004111 in words is "twenty million, four thousand, one hundred eleven".