20533325 has 6 divisors (see below), whose sum is σ = 25461354. Its totient is φ = 16426640.

The previous prime is 20533321. The next prime is 20533327. The reversal of 20533325 is 52333502.

It can be written as a sum of positive squares in 3 ways, for example, as 3364 + 20529961 = 58^2 + 4531^2 .

It is not a de Polignac number, because 20533325 - 2² = 20533321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20533325.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20533321) 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 5 ways as a sum of consecutive naturals, for example, 410642 + ... + 410691.

It is an arithmetic number, because the mean of its divisors is an integer number (4243559).

Almost surely, 2^20533325 is an apocalyptic number.

20533325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20533325 is a deficient number, since it is larger than the sum of its proper divisors (4928029).

20533325 is an equidigital number, since it uses as much as digits as its factorization.

20533325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821343 (or 821338 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 23.

The square root of 20533325 is about 4531.3712052755. The cubic root of 20533325 is about 273.8334052204.

Adding to 20533325 its reverse (52333502), we get a palindrome (72866827).

The spelling of 20533325 in words is "twenty million, five hundred thirty-three thousand, three hundred twenty-five".