20806925 has 12 divisors (see below), whose sum is σ = 25894176. Its totient is φ = 16585200.

The previous prime is 20806897. The next prime is 20806937. The reversal of 20806925 is 52960802.

It is not a de Polignac number, because 20806925 - 2²⁴ = 4029709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20806891 and 20806900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6320 + ... + 9030.

It is an arithmetic number, because the mean of its divisors is an integer number (2157848).

Almost surely, 2^20806925 is an apocalyptic number.

20806925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20806925 is a deficient number, since it is larger than the sum of its proper divisors (5087251).

20806925 is a wasteful number, since it uses less digits than its factorization.

20806925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3028 (or 3023 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 20806925 is about 4561.4608405641. The cubic root of 20806925 is about 275.0442903870.

The spelling of 20806925 in words is "twenty million, eight hundred six thousand, nine hundred twenty-five".