20012209 has 8 divisors (see below), whose sum is σ = 23246528. Its totient is φ = 16871760.

The previous prime is 20012207. The next prime is 20012219. The reversal of 20012209 is 90221002.

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 20012209 - 2¹ = 20012207 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20012192 and 20012201.

It is not an unprimeable number, because it can be changed into a prime (20012203) 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, 23007 + ... + 23860.

It is an arithmetic number, because the mean of its divisors is an integer number (2905816).

Almost surely, 2^20012209 is an apocalyptic number.

It is an amenable number.

20012209 is a deficient number, since it is larger than the sum of its proper divisors (3234319).

20012209 is an equidigital number, since it uses as much as digits as its factorization.

20012209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46935.

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

The square root of 20012209 is about 4473.5007544428. The cubic root of 20012209 is about 271.4969842986.

The spelling of 20012209 in words is "twenty million, twelve thousand, two hundred nine".