20841825 has 12 divisors (see below), whose sum is σ = 34458608. Its totient is φ = 11115600.

The previous prime is 20841823. The next prime is 20841853. The reversal of 20841825 is 52814802.

It is not a de Polignac number, because 20841825 - 2¹ = 20841823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20841792 and 20841801.

It is not an unprimeable number, because it can be changed into a prime (20841823) 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 11 ways as a sum of consecutive naturals, for example, 138871 + ... + 139020.

Almost surely, 2^20841825 is an apocalyptic number.

20841825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20841825 is a deficient number, since it is larger than the sum of its proper divisors (13616783).

20841825 is a wasteful number, since it uses less digits than its factorization.

20841825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277904 (or 277899 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 20841825 is about 4565.2847665836. The cubic root of 20841825 is about 275.1979841504.

The spelling of 20841825 in words is "twenty million, eight hundred forty-one thousand, eight hundred twenty-five".