20673399 has 4 divisors (see below), whose sum is σ = 27564536. Its totient is φ = 13782264.

The previous prime is 20673397. The next prime is 20673403. The reversal of 20673399 is 99337602.

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

It is not a de Polignac number, because 20673399 - 2¹ = 20673397 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 (20673397) 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, 3445564 + ... + 3445569.

It is an arithmetic number, because the mean of its divisors is an integer number (6891134).

Almost surely, 2^20673399 is an apocalyptic number.

20673399 is a deficient number, since it is larger than the sum of its proper divisors (6891137).

20673399 is an equidigital number, since it uses as much as digits as its factorization.

20673399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6891136.

The product of its (nonzero) digits is 61236, while the sum is 39.

The square root of 20673399 is about 4546.8009633148. The cubic root of 20673399 is about 274.4546724934.

The spelling of 20673399 in words is "twenty million, six hundred seventy-three thousand, three hundred ninety-nine".