20605373 has 4 divisors (see below), whose sum is σ = 20943228. Its totient is φ = 20267520.

The previous prime is 20605349. The next prime is 20605391. The reversal of 20605373 is 37350602.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8508889 + 12096484 = 2917^2 + 3478^2 .

It is a cyclic number.

It is not a de Polignac number, because 20605373 - 2¹⁰ = 20604349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20605073) 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, 168836 + ... + 168957.

It is an arithmetic number, because the mean of its divisors is an integer number (5235807).

Almost surely, 2^20605373 is an apocalyptic number.

It is an amenable number.

20605373 is a deficient number, since it is larger than the sum of its proper divisors (337855).

20605373 is an equidigital number, since it uses as much as digits as its factorization.

20605373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337854.

The product of its (nonzero) digits is 3780, while the sum is 26.

The square root of 20605373 is about 4539.3141552442. The cubic root of 20605373 is about 274.1533098734.

Adding to 20605373 its reverse (37350602), we get a palindrome (57955975).

The spelling of 20605373 in words is "twenty million, six hundred five thousand, three hundred seventy-three".