20344745 has 4 divisors (see below), whose sum is σ = 24413700. Its totient is φ = 16275792.

The previous prime is 20344703. The next prime is 20344759. The reversal of 20344745 is 54744302.

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 12880921 + 7463824 = 3589^2 + 2732^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20344745 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2034470 + ... + 2034479.

It is an arithmetic number, because the mean of its divisors is an integer number (6103425).

Almost surely, 2^20344745 is an apocalyptic number.

It is an amenable number.

20344745 is a deficient number, since it is larger than the sum of its proper divisors (4068955).

20344745 is an equidigital number, since it uses as much as digits as its factorization.

20344745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4068954.

The product of its (nonzero) digits is 13440, while the sum is 29.

The square root of 20344745 is about 4510.5149373436. The cubic root of 20344745 is about 272.9925217217.

The spelling of 20344745 in words is "twenty million, three hundred forty-four thousand, seven hundred forty-five".