20117245 has 8 divisors (see below), whose sum is σ = 24275160. Its totient is φ = 16004160.

The previous prime is 20117243. The next prime is 20117261. The reversal of 20117245 is 54271102.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 376996 + 19740249 = 614^2 + 4443^2 .

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

It is not a de Polignac number, because 20117245 - 2¹ = 20117243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20117243) 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, 10210 + ... + 12019.

It is an arithmetic number, because the mean of its divisors is an integer number (3034395).

Almost surely, 2^20117245 is an apocalyptic number.

It is an amenable number.

20117245 is a deficient number, since it is larger than the sum of its proper divisors (4157915).

20117245 is a wasteful number, since it uses less digits than its factorization.

20117245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22415.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 20117245 is about 4485.2251894414. The cubic root of 20117245 is about 271.9711483599.

Adding to 20117245 its reverse (54271102), we get a palindrome (74388347).

The spelling of 20117245 in words is "twenty million, one hundred seventeen thousand, two hundred forty-five".