20245247 has 8 divisors (see below), whose sum is σ = 22135680. Its totient is φ = 18363160.

The previous prime is 20245237. The next prime is 20245259. The reversal of 20245247 is 74254202.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20245247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20245237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3704 + ... + 7362.

It is an arithmetic number, because the mean of its divisors is an integer number (2766960).

Almost surely, 2^20245247 is an apocalyptic number.

20245247 is a deficient number, since it is larger than the sum of its proper divisors (1890433).

20245247 is a wasteful number, since it uses less digits than its factorization.

20245247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4173.

The product of its (nonzero) digits is 4480, while the sum is 26.

The square root of 20245247 is about 4499.4718578962. The cubic root of 20245247 is about 272.5467618878.

Adding to 20245247 its reverse (74254202), we get a palindrome (94499449).

The spelling of 20245247 in words is "twenty million, two hundred forty-five thousand, two hundred forty-seven".