20673205 has 32 divisors (see below), whose sum is σ = 30140928. Its totient is φ = 13305600.

The previous prime is 20673203. The next prime is 20673209. The reversal of 20673205 is 50237602.

It is not a de Polignac number, because 20673205 - 2¹ = 20673203 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20673205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20673203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48895 + ... + 49315.

It is an arithmetic number, because the mean of its divisors is an integer number (941904).

Almost surely, 2^20673205 is an apocalyptic number.

It is an amenable number.

20673205 is a deficient number, since it is larger than the sum of its proper divisors (9467723).

20673205 is a wasteful number, since it uses less digits than its factorization.

20673205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 20673205 is about 4546.7796295840. The cubic root of 20673205 is about 274.4538139929.

The spelling of 20673205 in words is "twenty million, six hundred seventy-three thousand, two hundred five".