20804925 has 24 divisors (see below), whose sum is σ = 34529536. Its totient is φ = 11053440.

The previous prime is 20804911. The next prime is 20804929. The reversal of 20804925 is 52940802.

It is not a de Polignac number, because 20804925 - 2⁴ = 20804909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20804892 and 20804901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20804929) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33972 + ... + 34578.

Almost surely, 2^20804925 is an apocalyptic number.

20804925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20804925 is a deficient number, since it is larger than the sum of its proper divisors (13724611).

20804925 is a wasteful number, since it uses less digits than its factorization.

20804925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077 (or 1072 counting only the distinct ones).

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

The square root of 20804925 is about 4561.2416072819. The cubic root of 20804925 is about 275.0354775165.

The spelling of 20804925 in words is "twenty million, eight hundred four thousand, nine hundred twenty-five".