20340245 has 8 divisors (see below), whose sum is σ = 25844184. Its totient is φ = 15314944.

The previous prime is 20340233. The next prime is 20340251. The reversal of 20340245 is 54204302.

It can be written as a sum of positive squares in 4 ways, for example, as 8773444 + 11566801 = 2962^2 + 3401^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20340245 - 2¹² = 20336149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119564 + ... + 119733.

It is an arithmetic number, because the mean of its divisors is an integer number (3230523).

Almost surely, 2^20340245 is an apocalyptic number.

It is an amenable number.

20340245 is a deficient number, since it is larger than the sum of its proper divisors (5503939).

20340245 is a wasteful number, since it uses less digits than its factorization.

20340245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239319.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 20340245 is about 4510.0160753594. The cubic root of 20340245 is about 272.9723927411.

Adding to 20340245 its reverse (54204302), we get a palindrome (74544547).

The spelling of 20340245 in words is "twenty million, three hundred forty thousand, two hundred forty-five".