20855925 has 18 divisors (see below), whose sum is σ = 37355682. Its totient is φ = 11123040.

The previous prime is 20855911. The next prime is 20855929. The reversal of 20855925 is 52955802.

It can be written as a sum of positive squares in 3 ways, for example, as 7569 + 20848356 = 87^2 + 4566^2 .

It is not a de Polignac number, because 20855925 - 2⁴ = 20855909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20855925.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20855929) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 46122 + ... + 46571.

Almost surely, 2^20855925 is an apocalyptic number.

20855925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20855925 is a deficient number, since it is larger than the sum of its proper divisors (16499757).

20855925 is a wasteful number, since it uses less digits than its factorization.

20855925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92709 (or 92701 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The square root of 20855925 is about 4566.8287684125. The cubic root of 20855925 is about 275.2600295306.

The spelling of 20855925 in words is "twenty million, eight hundred fifty-five thousand, nine hundred twenty-five".