19966425 has 24 divisors (see below), whose sum is σ = 33640704. Its totient is φ = 10445760.

The previous prime is 19966423. The next prime is 19966439. The reversal of 19966425 is 52466991.

It is a happy number.

It is not a de Polignac number, because 19966425 - 2¹ = 19966423 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19966423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1464 + ... + 6486.

It is an arithmetic number, because the mean of its divisors is an integer number (1401696).

Almost surely, 2^19966425 is an apocalyptic number.

19966425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19966425 is a deficient number, since it is larger than the sum of its proper divisors (13674279).

19966425 is a wasteful number, since it uses less digits than its factorization.

19966425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5089 (or 5084 counting only the distinct ones).

The product of its digits is 116640, while the sum is 42.

The square root of 19966425 is about 4468.3805791360. The cubic root of 19966425 is about 271.2897822968.

The spelling of 19966425 in words is "nineteen million, nine hundred sixty-six thousand, four hundred twenty-five".