20500225 has 24 divisors (see below), whose sum is σ = 26426880. Its totient is φ = 15765120.

The previous prime is 20500223. The next prime is 20500229. The reversal of 20500225 is 52200502.

It is not a de Polignac number, because 20500225 - 2¹ = 20500223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20500199 and 20500208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20500223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85656 + ... + 85894.

It is an arithmetic number, because the mean of its divisors is an integer number (1101120).

Almost surely, 2^20500225 is an apocalyptic number.

20500225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20500225 is a deficient number, since it is larger than the sum of its proper divisors (5926655).

20500225 is a wasteful number, since it uses less digits than its factorization.

20500225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369 (or 364 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 16.

The square root of 20500225 is about 4527.7174160939. The cubic root of 20500225 is about 273.6861850235.

Adding to 20500225 its reverse (52200502), we get a palindrome (72700727).

The spelling of 20500225 in words is "twenty million, five hundred thousand, two hundred twenty-five".