20826625 has 8 divisors (see below), whose sum is σ = 25991784. Its totient is φ = 16661200.

The previous prime is 20826613. The next prime is 20826629. The reversal of 20826625 is 52662802.

It can be written as a sum of positive squares in 4 ways, for example, as 5089536 + 15737089 = 2256^2 + 3967^2 .

It is not a de Polignac number, because 20826625 - 2¹⁷ = 20695553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20826629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83182 + ... + 83431.

It is an arithmetic number, because the mean of its divisors is an integer number (3248973).

Almost surely, 2^20826625 is an apocalyptic number.

20826625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20826625 is a deficient number, since it is larger than the sum of its proper divisors (5165159).

20826625 is an equidigital number, since it uses as much as digits as its factorization.

20826625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166628 (or 166618 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 20826625 is about 4563.6197256126. The cubic root of 20826625 is about 275.1310669992.

The spelling of 20826625 in words is "twenty million, eight hundred twenty-six thousand, six hundred twenty-five".