20743045 has 4 divisors (see below), whose sum is σ = 24891660. Its totient is φ = 16594432.

The previous prime is 20743039. The next prime is 20743081. The reversal of 20743045 is 54034702.

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 4088484 + 16654561 = 2022^2 + 4081^2 .

It is a cyclic number.

It is not a de Polignac number, because 20743045 - 2⁵ = 20743013 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2074300 + ... + 2074309.

It is an arithmetic number, because the mean of its divisors is an integer number (6222915).

Almost surely, 2^20743045 is an apocalyptic number.

It is an amenable number.

20743045 is a deficient number, since it is larger than the sum of its proper divisors (4148615).

20743045 is an equidigital number, since it uses as much as digits as its factorization.

20743045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4148614.

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 20743045 is about 4554.4533151631. The cubic root of 20743045 is about 274.7625277757.

Adding to 20743045 its reverse (54034702), we get a palindrome (74777747).

The spelling of 20743045 in words is "twenty million, seven hundred forty-three thousand, forty-five".