20100111 has 8 divisors (see below), whose sum is σ = 27065904. Its totient is φ = 13267200.

The previous prime is 20100097. The next prime is 20100149. The reversal of 20100111 is 11100102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20100111 - 2⁵ = 20100079 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20100111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32866 + ... + 33471.

It is an arithmetic number, because the mean of its divisors is an integer number (3383238).

Almost surely, 2^20100111 is an apocalyptic number.

20100111 is a deficient number, since it is larger than the sum of its proper divisors (6965793).

20100111 is a wasteful number, since it uses less digits than its factorization.

20100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66441.

The product of its (nonzero) digits is 2, while the sum is 6.

The square root of 20100111 is about 4483.3147335426. The cubic root of 20100111 is about 271.8939131776.

Adding to 20100111 its reverse (11100102), we get a palindrome (31200213).

Subtracting from 20100111 its reverse (11100102), we obtain a palindrome (9000009).

Multiplying 20100111 by its reverse (11100102), we get a palindrome (223113282311322).

The spelling of 20100111 in words is "twenty million, one hundred thousand, one hundred eleven".