20864925 has 24 divisors (see below), whose sum is σ = 38330880. Its totient is φ = 11127600.

The previous prime is 20864923. The next prime is 20864947. The reversal of 20864925 is 52946802.

It is a happy number.

20864925 is a `hidden beast` number, since 2 + 0 + 8 + 649 + 2 + 5 = 666.

It is not a de Polignac number, because 20864925 - 2¹ = 20864923 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20864925.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20864923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14781 + ... + 16130.

It is an arithmetic number, because the mean of its divisors is an integer number (1597120).

Almost surely, 2^20864925 is an apocalyptic number.

20864925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20864925 is a deficient number, since it is larger than the sum of its proper divisors (17465955).

20864925 is a wasteful number, since it uses less digits than its factorization.

20864925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30930 (or 30919 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 20864925 is about 4567.8140286137. The cubic root of 20864925 is about 275.2996183445.

The spelling of 20864925 in words is "twenty million, eight hundred sixty-four thousand, nine hundred twenty-five".