20553325 has 12 divisors (see below), whose sum is σ = 27447028. Its totient is φ = 15177600.

The previous prime is 20553301. The next prime is 20553331. The reversal of 20553325 is 52335502.

It can be written as a sum of positive squares in 6 ways, for example, as 3759721 + 16793604 = 1939^2 + 4098^2 .

It is not a de Polignac number, because 20553325 - 2¹¹ = 20551277 is a prime.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (25).

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 20553325.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31296 + ... + 31945.

Almost surely, 2^20553325 is an apocalyptic number.

20553325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20553325 is a deficient number, since it is larger than the sum of its proper divisors (6893703).

20553325 is a wasteful number, since it uses less digits than its factorization.

20553325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63264 (or 63259 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 25.

The square root of 20553325 is about 4533.5775056792. The cubic root of 20553325 is about 273.9222833559.

Adding to 20553325 its reverse (52335502), we get a palindrome (72888827).

The spelling of 20553325 in words is "twenty million, five hundred fifty-three thousand, three hundred twenty-five".