20866125 has 32 divisors (see below), whose sum is σ = 39686400. Its totient is φ = 9537600.

The previous prime is 20866121. The next prime is 20866147. The reversal of 20866125 is 52166802.

It is not a de Polignac number, because 20866125 - 2² = 20866121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20866092 and 20866101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20866121) 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 31 ways as a sum of consecutive naturals, for example, 1350 + ... + 6599.

It is an arithmetic number, because the mean of its divisors is an integer number (1240200).

Almost surely, 2^20866125 is an apocalyptic number.

20866125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20866125 is a deficient number, since it is larger than the sum of its proper divisors (18820275).

20866125 is an equidigital number, since it uses as much as digits as its factorization.

20866125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7974 (or 7964 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 20866125 is about 4567.9453805841. The cubic root of 20866125 is about 275.3048959928.

The spelling of 20866125 in words is "twenty million, eight hundred sixty-six thousand, one hundred twenty-five".