20153225 has 6 divisors (see below), whose sum is σ = 24990030. Its totient is φ = 16122560.

The previous prime is 20153219. The next prime is 20153227. The reversal of 20153225 is 52235102.

It can be written as a sum of positive squares in 3 ways, for example, as 1860496 + 18292729 = 1364^2 + 4277^2 .

It is not a de Polignac number, because 20153225 - 2⁴ = 20153209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20153197 and 20153206.

It is not an unprimeable number, because it can be changed into a prime (20153227) 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, 403040 + ... + 403089.

It is an arithmetic number, because the mean of its divisors is an integer number (4165005).

Almost surely, 2^20153225 is an apocalyptic number.

20153225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20153225 is a deficient number, since it is larger than the sum of its proper divisors (4836805).

20153225 is an equidigital number, since it uses as much as digits as its factorization.

20153225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806139 (or 806134 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 20153225 is about 4489.2343445180. The cubic root of 20153225 is about 272.1331933095.

Adding to 20153225 its reverse (52235102), we get a palindrome (72388327).

The spelling of 20153225 in words is "twenty million, one hundred fifty-three thousand, two hundred twenty-five".