20306245 has 8 divisors (see below), whose sum is σ = 25800984. Its totient is φ = 15289344.

The previous prime is 20306243. The next prime is 20306257. The reversal of 20306245 is 54260302.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7107556 + 13198689 = 2666^2 + 3633^2 .

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 20306245 - 2¹ = 20306243 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 (20306243) by changing a digit.

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, 119364 + ... + 119533.

It is an arithmetic number, because the mean of its divisors is an integer number (3225123).

Almost surely, 2^20306245 is an apocalyptic number.

It is an amenable number.

20306245 is a deficient number, since it is larger than the sum of its proper divisors (5494739).

20306245 is a wasteful number, since it uses less digits than its factorization.

20306245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238919.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 20306245 is about 4506.2451109544. The cubic root of 20306245 is about 272.8202110695.

Adding to 20306245 its reverse (54260302), we get a palindrome (74566547).

The spelling of 20306245 in words is "twenty million, three hundred six thousand, two hundred forty-five".