20672209 has 8 divisors (see below), whose sum is σ = 21860640. Its totient is φ = 19493856.

The previous prime is 20672131. The next prime is 20672227. The reversal of 20672209 is 90227602.

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 20672209 - 2⁷ = 20672081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20672269) 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, 1917 + ... + 6709.

It is an arithmetic number, because the mean of its divisors is an integer number (2732580).

Almost surely, 2^20672209 is an apocalyptic number.

It is an amenable number.

20672209 is a deficient number, since it is larger than the sum of its proper divisors (1188431).

20672209 is a wasteful number, since it uses less digits than its factorization.

20672209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5039.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 20672209 is about 4546.6701001942. The cubic root of 20672209 is about 274.4494063488.

The spelling of 20672209 in words is "twenty million, six hundred seventy-two thousand, two hundred nine".