20556125 has 8 divisors (see below), whose sum is σ = 25654200. Its totient is φ = 16444800.

The previous prime is 20556121. The next prime is 20556149. The reversal of 20556125 is 52165502.

It can be written as a sum of positive squares in 4 ways, for example, as 98596 + 20457529 = 314^2 + 4523^2 .

It is not a de Polignac number, because 20556125 - 2² = 20556121 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20556094 and 20556103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20556121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82100 + ... + 82349.

It is an arithmetic number, because the mean of its divisors is an integer number (3206775).

Almost surely, 2^20556125 is an apocalyptic number.

20556125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20556125 is a deficient number, since it is larger than the sum of its proper divisors (5098075).

20556125 is an equidigital number, since it uses as much as digits as its factorization.

20556125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164464 (or 164454 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 20556125 is about 4533.8863020592. The cubic root of 20556125 is about 273.9347216932.

The spelling of 20556125 in words is "twenty million, five hundred fifty-six thousand, one hundred twenty-five".