19947825 has 18 divisors (see below), whose sum is σ = 35729174. Its totient is φ = 10638720.

The previous prime is 19947797. The next prime is 19947869. The reversal of 19947825 is 52874991.

It can be written as a sum of positive squares in 3 ways, for example, as 1595169 + 18352656 = 1263^2 + 4284^2 .

It is a de Polignac number, because none of the positive numbers 2^k-19947825 is a prime.

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

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 44104 + ... + 44553.

Almost surely, 2^19947825 is an apocalyptic number.

19947825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19947825 is a deficient number, since it is larger than the sum of its proper divisors (15781349).

19947825 is a wasteful number, since it uses less digits than its factorization.

19947825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88673 (or 88665 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 19947825 is about 4466.2988032598. The cubic root of 19947825 is about 271.2055148721.

The spelling of 19947825 in words is "nineteen million, nine hundred forty-seven thousand, eight hundred twenty-five".