20200111 has 2 divisors, whose sum is σ = 20200112. Its totient is φ = 20200110.

The previous prime is 20200109. The next prime is 20200121. The reversal of 20200111 is 11100202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20200111 - 2¹ = 20200109 is a prime.

Together with 20200109, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20200094 and 20200103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20200121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100055 + 10100056.

It is an arithmetic number, because the mean of its divisors is an integer number (10100056).

Almost surely, 2^20200111 is an apocalyptic number.

20200111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20200111 is an equidigital number, since it uses as much as digits as its factorization.

20200111 is an evil number, because the sum of its binary digits is even.

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

The square root of 20200111 is about 4494.4533594198. The cubic root of 20200111 is about 272.3440670031.

Adding to 20200111 its reverse (11100202), we get a palindrome (31300313).

Subtracting from 20200111 its reverse (11100202), we obtain a palindrome (9099909).

The spelling of 20200111 in words is "twenty million, two hundred thousand, one hundred eleven".