20647125 has 24 divisors (see below), whose sum is σ = 37221912. Its totient is φ = 11011200.

The previous prime is 20647117. The next prime is 20647139. The reversal of 20647125 is 52174602.

20647125 is a `hidden beast` number, since 2 + 0 + 647 + 12 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5225796 + 15421329 = 2286^2 + 3927^2 .

It is not a de Polignac number, because 20647125 - 2³ = 20647117 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 8052 + ... + 10301.

It is an arithmetic number, because the mean of its divisors is an integer number (1550913).

Almost surely, 2^20647125 is an apocalyptic number.

20647125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20647125 is a deficient number, since it is larger than the sum of its proper divisors (16574787).

20647125 is a wasteful number, since it uses less digits than its factorization.

20647125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18374 (or 18361 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20647125 is about 4543.9107605674. The cubic root of 20647125 is about 274.3383542709.

The spelling of 20647125 in words is "twenty million, six hundred forty-seven thousand, one hundred twenty-five".