20009825 has 12 divisors (see below), whose sum is σ = 27068208. Its totient is φ = 14552400.

The previous prime is 20009819. The next prime is 20009863. The reversal of 20009825 is 52890002.

It is not a de Polignac number, because 20009825 - 2⁶ = 20009761 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20009794 and 20009803.

It is an unprimeable number.

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, 36107 + ... + 36656.

It is an arithmetic number, because the mean of its divisors is an integer number (2255684).

Almost surely, 2^20009825 is an apocalyptic number.

20009825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20009825 is a deficient number, since it is larger than the sum of its proper divisors (7058383).

20009825 is a wasteful number, since it uses less digits than its factorization.

20009825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72784 (or 72779 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 20009825 is about 4473.2342885210. The cubic root of 20009825 is about 271.4862029715.

Adding to 20009825 its reverse (52890002), we get a palindrome (72899827).

The spelling of 20009825 in words is "twenty million, nine thousand, eight hundred twenty-five".