20996825 has 6 divisors (see below), whose sum is σ = 26036094. Its totient is φ = 16797440.

The previous prime is 20996803. The next prime is 20996849. The reversal of 20996825 is 52869902.

It can be written as a sum of positive squares in 3 ways, for example, as 29584 + 20967241 = 172^2 + 4579^2 .

It is not a de Polignac number, because 20996825 - 2¹⁴ = 20980441 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 419912 + ... + 419961.

It is an arithmetic number, because the mean of its divisors is an integer number (4339349).

Almost surely, 2^20996825 is an apocalyptic number.

20996825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20996825 is a deficient number, since it is larger than the sum of its proper divisors (5039269).

20996825 is an equidigital number, since it uses as much as digits as its factorization.

20996825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839883 (or 839878 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 20996825 is about 4582.2292609602. The cubic root of 20996825 is about 275.8785128353.

The spelling of 20996825 in words is "twenty million, nine hundred ninety-six thousand, eight hundred twenty-five".