20120111 has 8 divisors (see below), whose sum is σ = 22108800. Its totient is φ = 18158040.

The previous prime is 20120081. The next prime is 20120143. The reversal of 20120111 is 11102102.

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

It is a cyclic number.

It is not a de Polignac number, because 20120111 - 2⁶ = 20120047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120161) 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 7 ways as a sum of consecutive naturals, for example, 5051 + ... + 8108.

It is an arithmetic number, because the mean of its divisors is an integer number (2763600).

Almost surely, 2^20120111 is an apocalyptic number.

20120111 is a deficient number, since it is larger than the sum of its proper divisors (1988689).

20120111 is a wasteful number, since it uses less digits than its factorization.

20120111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13309.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 20120111 is about 4485.5446714975. The cubic root of 20120111 is about 271.9840631882.

Adding to 20120111 its reverse (11102102), we get a palindrome (31222213).

Subtracting from 20120111 its reverse (11102102), we obtain a square (9018009 = 3003²).

The spelling of 20120111 in words is "twenty million, one hundred twenty thousand, one hundred eleven".