20646125 has 16 divisors (see below), whose sum is σ = 25896000. Its totient is φ = 16434000.

The previous prime is 20646107. The next prime is 20646137. The reversal of 20646125 is 52164602.

It is not a de Polignac number, because 20646125 - 2⁶ = 20646061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20646094 and 20646103.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 41126 + ... + 41624.

It is an arithmetic number, because the mean of its divisors is an integer number (1618500).

Almost surely, 2^20646125 is an apocalyptic number.

20646125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20646125 is a deficient number, since it is larger than the sum of its proper divisors (5249875).

20646125 is an equidigital number, since it uses as much as digits as its factorization.

20646125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845 (or 835 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20646125 is about 4543.8007218627. The cubic root of 20646125 is about 274.3339251994. Note that the first 3 decimals are identical.

The spelling of 20646125 in words is "twenty million, six hundred forty-six thousand, one hundred twenty-five".