20730825 has 36 divisors (see below), whose sum is σ = 37398400. Its totient is φ = 10977120.

The previous prime is 20730823. The next prime is 20730839. The reversal of 20730825 is 52803702.

It is not a de Polignac number, because 20730825 - 2¹ = 20730823 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20730823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 44544 + ... + 45006.

Almost surely, 2^20730825 is an apocalyptic number.

20730825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20730825 is a deficient number, since it is larger than the sum of its proper divisors (16667575).

20730825 is a wasteful number, since it uses less digits than its factorization.

20730825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20730825 is about 4553.1115734188. Note that the first 3 decimals coincide. The cubic root of 20730825 is about 274.7085617735.

The spelling of 20730825 in words is "twenty million, seven hundred thirty thousand, eight hundred twenty-five".