20002111 has 4 divisors (see below), whose sum is σ = 20871792. Its totient is φ = 19132432.

The previous prime is 20002097. The next prime is 20002123. The reversal of 20002111 is 11120002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11120002 = 2 ⋅5560001.

It is a cyclic number.

It is not a de Polignac number, because 20002111 - 2⁷ = 20001983 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20002094 and 20002103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20062111) 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, 434806 + ... + 434851.

It is an arithmetic number, because the mean of its divisors is an integer number (5217948).

Almost surely, 2^20002111 is an apocalyptic number.

20002111 is a deficient number, since it is larger than the sum of its proper divisors (869681).

20002111 is an equidigital number, since it uses as much as digits as its factorization.

20002111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869680.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 20002111 is about 4472.3719657470. The cubic root of 20002111 is about 271.4513115495.

Adding to 20002111 its reverse (11120002), we get a palindrome (31122113).

It can be divided in two parts, 20002 and 111, that multiplied together give a palindrome (2220222).

The spelling of 20002111 in words is "twenty million, two thousand, one hundred eleven".