19988725 has 12 divisors (see below), whose sum is σ = 25864416. Its totient is φ = 15295280.

The previous prime is 19988699. The next prime is 19988737. The reversal of 19988725 is 52788991.

It is not a de Polignac number, because 19988725 - 2¹¹ = 19986677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16807 + ... + 17956.

It is an arithmetic number, because the mean of its divisors is an integer number (2155368).

Almost surely, 2^19988725 is an apocalyptic number.

It is an amenable number.

19988725 is a deficient number, since it is larger than the sum of its proper divisors (5875691).

19988725 is a wasteful number, since it uses less digits than its factorization.

19988725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34796 (or 34791 counting only the distinct ones).

The product of its digits is 362880, while the sum is 49.

The square root of 19988725 is about 4470.8751939637. The cubic root of 19988725 is about 271.3907436401.

The spelling of 19988725 in words is "nineteen million, nine hundred eighty-eight thousand, seven hundred twenty-five".