20122009 has 8 divisors (see below), whose sum is σ = 20802240. Its totient is φ = 19453200.

The previous prime is 20121989. The next prime is 20122031. The reversal of 20122009 is 90022102.

It is a happy number.

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 20122009 - 2¹³ = 20113817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20121983 and 20122001.

It is not an unprimeable number, because it can be changed into a prime (20122049) 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, 804 + ... + 6394.

It is an arithmetic number, because the mean of its divisors is an integer number (2600280).

Almost surely, 2^20122009 is an apocalyptic number.

It is an amenable number.

20122009 is a deficient number, since it is larger than the sum of its proper divisors (680231).

20122009 is an equidigital number, since it uses as much as digits as its factorization.

20122009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5711.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 20122009 is about 4485.7562350177. The cubic root of 20122009 is about 271.9926153200.

The spelling of 20122009 in words is "twenty million, one hundred twenty-two thousand, nine".