20566125 has 48 divisors (see below), whose sum is σ = 37647792. Its totient is φ = 10800000.

The previous prime is 20566123. The next prime is 20566129. The reversal of 20566125 is 52166502.

It can be written as a sum of positive squares in 8 ways, for example, as 7584516 + 12981609 = 2754^2 + 3603^2 .

It is not a de Polignac number, because 20566125 - 2¹ = 20566123 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 (20566121) 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 47 ways as a sum of consecutive naturals, for example, 113535 + ... + 113715.

It is an arithmetic number, because the mean of its divisors is an integer number (784329).

Almost surely, 2^20566125 is an apocalyptic number.

20566125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20566125 is a deficient number, since it is larger than the sum of its proper divisors (17081667).

20566125 is a wasteful number, since it uses less digits than its factorization.

20566125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303 (or 290 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 20566125 is about 4534.9889746283. The cubic root of 20566125 is about 273.9791351082.

The spelling of 20566125 in words is "twenty million, five hundred sixty-six thousand, one hundred twenty-five".