19968525 has 72 divisors (see below), whose sum is σ = 39268320. Its totient is φ = 10031040.

The previous prime is 19968521. The next prime is 19968539. The reversal of 19968525 is 52586991.

It is not a de Polignac number, because 19968525 - 2² = 19968521 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

Its product of digits (194400) is a multiple of the sum of its prime divisors (200).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19968521) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 115339 + ... + 115511.

Almost surely, 2^19968525 is an apocalyptic number.

19968525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19968525 is a deficient number, since it is larger than the sum of its proper divisors (19299795).

19968525 is a wasteful number, since it uses less digits than its factorization.

19968525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217 (or 200 counting only the distinct ones).

The product of its digits is 194400, while the sum is 45.

The square root of 19968525 is about 4468.6155574182. The cubic root of 19968525 is about 271.2992930725.

The spelling of 19968525 in words is "nineteen million, nine hundred sixty-eight thousand, five hundred twenty-five".