19945925 has 12 divisors (see below), whose sum is σ = 24821700. Its totient is φ = 15899520.

The previous prime is 19945903. The next prime is 19945943. The reversal of 19945925 is 52954991.

It can be written as a sum of positive squares in 6 ways, for example, as 1136356 + 18809569 = 1066^2 + 4337^2 .

It is not a de Polignac number, because 19945925 - 2²² = 15751621 is a prime.

It is a Curzon number.

It is a congruent number.

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, 6551 + ... + 9099.

It is an arithmetic number, because the mean of its divisors is an integer number (2068475).

Almost surely, 2^19945925 is an apocalyptic number.

It is an amenable number.

19945925 is a deficient number, since it is larger than the sum of its proper divisors (4875775).

19945925 is a wasteful number, since it uses less digits than its factorization.

19945925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2872 (or 2867 counting only the distinct ones).

The product of its digits is 145800, while the sum is 44.

The square root of 19945925 is about 4466.0860941097. The cubic root of 19945925 is about 271.1969039610.

The spelling of 19945925 in words is "nineteen million, nine hundred forty-five thousand, nine hundred twenty-five".