20857925 has 24 divisors (see below), whose sum is σ = 28629120. Its totient is φ = 14947200.

The previous prime is 20857919. The next prime is 20857933. The reversal of 20857925 is 52975802.

It is not a de Polignac number, because 20857925 - 2⁴ = 20857909 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 (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19556 + ... + 20594.

It is an arithmetic number, because the mean of its divisors is an integer number (1192880).

Almost surely, 2^20857925 is an apocalyptic number.

20857925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20857925 is a deficient number, since it is larger than the sum of its proper divisors (7771195).

20857925 is a wasteful number, since it uses less digits than its factorization.

20857925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133 (or 1128 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 20857925 is about 4567.0477334926. The cubic root of 20857925 is about 275.2688280289.

The spelling of 20857925 in words is "twenty million, eight hundred fifty-seven thousand, nine hundred twenty-five".