20355525 has 18 divisors (see below), whose sum is σ = 36459410. Its totient is φ = 10856160.

The previous prime is 20355523. The next prime is 20355541. The reversal of 20355525 is 52555302.

It can be written as a sum of positive squares in 3 ways, for example, as 2259009 + 18096516 = 1503^2 + 4254^2 .

It is not a de Polignac number, because 20355525 - 2¹ = 20355523 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20355523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 45010 + ... + 45459.

Almost surely, 2^20355525 is an apocalyptic number.

20355525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20355525 is a deficient number, since it is larger than the sum of its proper divisors (16103885).

20355525 is a wasteful number, since it uses less digits than its factorization.

20355525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90485 (or 90477 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 27.

The square root of 20355525 is about 4511.7097646014. The cubic root of 20355525 is about 273.0407297441.

The spelling of 20355525 in words is "twenty million, three hundred fifty-five thousand, five hundred twenty-five".