20113225 has 36 divisors (see below), whose sum is σ = 28118860. Its totient is φ = 14256000.

The previous prime is 20113217. The next prime is 20113231. The reversal of 20113225 is 52231102.

It can be written as a sum of positive squares in 6 ways, for example, as 2271049 + 17842176 = 1507^2 + 4224^2 .

It is not a de Polignac number, because 20113225 - 2³ = 20113217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20113199 and 20113208.

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 35 ways as a sum of consecutive naturals, for example, 184471 + ... + 184579.

Almost surely, 2^20113225 is an apocalyptic number.

20113225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20113225 is a deficient number, since it is larger than the sum of its proper divisors (8005635).

20113225 is a wasteful number, since it uses less digits than its factorization.

20113225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202 (or 186 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 20113225 is about 4484.7770290172. Note that the first 3 decimals coincide. The cubic root of 20113225 is about 271.9530312859.

Adding to 20113225 its reverse (52231102), we get a palindrome (72344327).

The spelling of 20113225 in words is "twenty million, one hundred thirteen thousand, two hundred twenty-five".