20500245 has 48 divisors (see below), whose sum is σ = 38413440. Its totient is φ = 10082688.

The previous prime is 20500231. The next prime is 20500247. The reversal of 20500245 is 54200502.

It is not a de Polignac number, because 20500245 - 2⁴ = 20500229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20500247) 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 47 ways as a sum of consecutive naturals, for example, 29674 + ... + 30356.

It is an arithmetic number, because the mean of its divisors is an integer number (800280).

Almost surely, 2^20500245 is an apocalyptic number.

It is an amenable number.

20500245 is a deficient number, since it is larger than the sum of its proper divisors (17913195).

20500245 is a wasteful number, since it uses less digits than its factorization.

20500245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746 (or 743 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 20500245 is about 4527.7196247118. The cubic root of 20500245 is about 273.6862740261.

Adding to 20500245 its reverse (54200502), we get a palindrome (74700747).

The spelling of 20500245 in words is "twenty million, five hundred thousand, two hundred forty-five".