20872825 has 6 divisors (see below), whose sum is σ = 25882334. Its totient is φ = 16698240.

The previous prime is 20872807. The next prime is 20872853. The reversal of 20872825 is 52827802.

It can be written as a sum of positive squares in 3 ways, for example, as 2322576 + 18550249 = 1524^2 + 4307^2 .

It is not a de Polignac number, because 20872825 - 2¹¹ = 20870777 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 417432 + ... + 417481.

Almost surely, 2^20872825 is an apocalyptic number.

20872825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20872825 is a deficient number, since it is larger than the sum of its proper divisors (5009509).

20872825 is an equidigital number, since it uses as much as digits as its factorization.

20872825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834923 (or 834918 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 20872825 is about 4568.6786930140. The cubic root of 20872825 is about 275.3343591444.

The spelling of 20872825 in words is "twenty million, eight hundred seventy-two thousand, eight hundred twenty-five".