19966025 has 6 divisors (see below), whose sum is σ = 24757902. Its totient is φ = 15972800.

The previous prime is 19966021. The next prime is 19966027. The reversal of 19966025 is 52066991.

It can be written as a sum of positive squares in 3 ways, for example, as 3286969 + 16679056 = 1813^2 + 4084^2 .

It is not a de Polignac number, because 19966025 - 2² = 19966021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19966025.

It is not an unprimeable number, because it can be changed into a prime (19966021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 399296 + ... + 399345.

It is an arithmetic number, because the mean of its divisors is an integer number (4126317).

Almost surely, 2^19966025 is an apocalyptic number.

It is an amenable number.

19966025 is a deficient number, since it is larger than the sum of its proper divisors (4791877).

19966025 is an equidigital number, since it uses as much as digits as its factorization.

19966025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798651 (or 798646 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 19966025 is about 4468.3358199670. The cubic root of 19966025 is about 271.2879706449.

The spelling of 19966025 in words is "nineteen million, nine hundred sixty-six thousand, twenty-five".