20533225 has 6 divisors (see below), whose sum is σ = 25461230. Its totient is φ = 16426560.

The previous prime is 20533223. The next prime is 20533241. The reversal of 20533225 is 52233502.

It can be written as a sum of positive squares in 3 ways, for example, as 6365529 + 14167696 = 2523^2 + 3764^2 .

It is not a de Polignac number, because 20533225 - 2¹ = 20533223 is a prime.

It is a super-2 number, since 2×20533225² = 843226657801250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20533196 and 20533205.

It is not an unprimeable number, because it can be changed into a prime (20533223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 410640 + ... + 410689.

Almost surely, 2^20533225 is an apocalyptic number.

20533225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20533225 is a deficient number, since it is larger than the sum of its proper divisors (4928005).

20533225 is an equidigital number, since it uses as much as digits as its factorization.

20533225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821339 (or 821334 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 22.

The square root of 20533225 is about 4531.3601710745. The cubic root of 20533225 is about 273.8329606848.

Adding to 20533225 its reverse (52233502), we get a palindrome (72766727).

The spelling of 20533225 in words is "twenty million, five hundred thirty-three thousand, two hundred twenty-five".