20051207 has 4 divisors (see below), whose sum is σ = 21874056. Its totient is φ = 18228360.

The previous prime is 20051179. The next prime is 20051221. The reversal of 20051207 is 70215002.

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 20051207 - 2⁸ = 20050951 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 (20051237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 911408 + ... + 911429.

It is an arithmetic number, because the mean of its divisors is an integer number (5468514).

Almost surely, 2^20051207 is an apocalyptic number.

20051207 is a deficient number, since it is larger than the sum of its proper divisors (1822849).

20051207 is a wasteful number, since it uses less digits than its factorization.

20051207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1822848.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 20051207 is about 4477.8574117540. The cubic root of 20051207 is about 271.6732261998.

Adding to 20051207 its reverse (70215002), we get a palindrome (90266209).

The spelling of 20051207 in words is "twenty million, fifty-one thousand, two hundred seven".