20344385 has 4 divisors (see below), whose sum is σ = 24413268. Its totient is φ = 16275504.

The previous prime is 20344369. The next prime is 20344403. The reversal of 20344385 is 58344302.

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 11296321 + 9048064 = 3361^2 + 3008^2 .

It is a cyclic number.

It is not a de Polignac number, because 20344385 - 2⁴ = 20344369 is a prime.

It is a Duffinian 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, 2034434 + ... + 2034443.

It is an arithmetic number, because the mean of its divisors is an integer number (6103317).

Almost surely, 2^20344385 is an apocalyptic number.

It is an amenable number.

20344385 is a deficient number, since it is larger than the sum of its proper divisors (4068883).

20344385 is an equidigital number, since it uses as much as digits as its factorization.

20344385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4068882.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 20344385 is about 4510.4750304153. The cubic root of 20344385 is about 272.9909115125.

Adding to 20344385 its reverse (58344302), we get a palindrome (78688687).

The spelling of 20344385 in words is "twenty million, three hundred forty-four thousand, three hundred eighty-five".