19906025 has 12 divisors (see below), whose sum is σ = 24998400. Its totient is φ = 15721680.

The previous prime is 19906021. The next prime is 19906043. The reversal of 19906025 is 52060991.

It is not a de Polignac number, because 19906025 - 2² = 19906021 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 19905982 and 19906000.

It is not an unprimeable number, because it can be changed into a prime (19906021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3065 + ... + 7014.

It is an arithmetic number, because the mean of its divisors is an integer number (2083200).

Almost surely, 2^19906025 is an apocalyptic number.

It is an amenable number.

19906025 is a deficient number, since it is larger than the sum of its proper divisors (5092375).

19906025 is a wasteful number, since it uses less digits than its factorization.

19906025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10168 (or 10163 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 19906025 is about 4461.6168593908. The cubic root of 19906025 is about 271.0159483722.

The spelling of 19906025 in words is "nineteen million, nine hundred six thousand, twenty-five".