20111207 has 4 divisors (see below), whose sum is σ = 20146056. Its totient is φ = 20076360.

The previous prime is 20111183. The next prime is 20111213. The reversal of 20111207 is 70211102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20111207 - 2¹⁰ = 20110183 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111191 and 20111200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111257) 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, 16544 + ... + 17717.

It is an arithmetic number, because the mean of its divisors is an integer number (5036514).

Almost surely, 2^20111207 is an apocalyptic number.

20111207 is a deficient number, since it is larger than the sum of its proper divisors (34849).

20111207 is an equidigital number, since it uses as much as digits as its factorization.

20111207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34848.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 20111207 is about 4484.5520400593. The cubic root of 20111207 is about 271.9439357849.

Adding to 20111207 its reverse (70211102), we get a palindrome (90322309).

The spelling of 20111207 in words is "twenty million, one hundred eleven thousand, two hundred seven".