20563245 has 24 divisors (see below), whose sum is σ = 36475296. Its totient is φ = 10711008.

The previous prime is 20563237. The next prime is 20563259. The reversal of 20563245 is 54236502.

20563245 is a `hidden beast` number, since 20 + 5 + 632 + 4 + 5 = 666.

It is not a de Polignac number, because 20563245 - 2³ = 20563237 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 3379 + ... + 7248.

It is an arithmetic number, because the mean of its divisors is an integer number (1519804).

Almost surely, 2^20563245 is an apocalyptic number.

It is an amenable number.

20563245 is a deficient number, since it is larger than the sum of its proper divisors (15912051).

20563245 is a wasteful number, since it uses less digits than its factorization.

20563245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10681 (or 10678 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 20563245 is about 4534.6714324193. The cubic root of 20563245 is about 273.9663455211.

Adding to 20563245 its reverse (54236502), we get a palindrome (74799747).

The spelling of 20563245 in words is "twenty million, five hundred sixty-three thousand, two hundred forty-five".