20489207 has 4 divisors (see below), whose sum is σ = 20546640. Its totient is φ = 20431776.

The previous prime is 20489191. The next prime is 20489221. The reversal of 20489207 is 70298402.

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 20489207 - 2⁴ = 20489191 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 (20489237) 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, 28178 + ... + 28895.

It is an arithmetic number, because the mean of its divisors is an integer number (5136660).

Almost surely, 2^20489207 is an apocalyptic number.

20489207 is a deficient number, since it is larger than the sum of its proper divisors (57433).

20489207 is an equidigital number, since it uses as much as digits as its factorization.

20489207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57432.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 20489207 is about 4526.5005246879. The cubic root of 20489207 is about 273.6371446711.

The spelling of 20489207 in words is "twenty million, four hundred eighty-nine thousand, two hundred seven".