20523225 has 12 divisors (see below), whose sum is σ = 33931856. Its totient is φ = 10945680.

The previous prime is 20523221. The next prime is 20523227. The reversal of 20523225 is 52232502.

It is not a de Polignac number, because 20523225 - 2² = 20523221 is a prime.

It is a super-3 number, since 3×20523225³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20523221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 136747 + ... + 136896.

Almost surely, 2^20523225 is an apocalyptic number.

20523225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20523225 is a deficient number, since it is larger than the sum of its proper divisors (13408631).

20523225 is a wasteful number, since it uses less digits than its factorization.

20523225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273656 (or 273651 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 20523225 is about 4530.2566152482. The cubic root of 20523225 is about 273.7884998290.

Adding to 20523225 its reverse (52232502), we get a palindrome (72755727).

The spelling of 20523225 in words is "twenty million, five hundred twenty-three thousand, two hundred twenty-five".