20675307 has 4 divisors (see below), whose sum is σ = 27567080. Its totient is φ = 13783536.

The previous prime is 20675273. The next prime is 20675309. The reversal of 20675307 is 70357602.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20675307 - 2²⁰ = 19626731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20675309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3445882 + ... + 3445887.

It is an arithmetic number, because the mean of its divisors is an integer number (6891770).

Almost surely, 2^20675307 is an apocalyptic number.

20675307 is a deficient number, since it is larger than the sum of its proper divisors (6891773).

20675307 is an equidigital number, since it uses as much as digits as its factorization.

20675307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6891772.

The product of its (nonzero) digits is 8820, while the sum is 30.

The square root of 20675307 is about 4547.0107763233. The cubic root of 20675307 is about 274.4631156044.

The spelling of 20675307 in words is "twenty million, six hundred seventy-five thousand, three hundred seven".