19800925 has 6 divisors (see below), whose sum is σ = 24553178. Its totient is φ = 15840720.

The previous prime is 19800899. The next prime is 19800929. The reversal of 19800925 is 52900891.

19800925 = 3146² + 3147².

It can be written as a sum of positive squares in 3 ways, for example, as 4575321 + 15225604 = 2139^2 + 3902^2 .

It is not a de Polignac number, because 19800925 - 2¹⁵ = 19768157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19800929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 395994 + ... + 396043.

Almost surely, 2^19800925 is an apocalyptic number.

19800925 is the 3147-th centered square number.

It is an amenable number.

19800925 is a deficient number, since it is larger than the sum of its proper divisors (4752253).

19800925 is an equidigital number, since it uses as much as digits as its factorization.

19800925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792047 (or 792042 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 19800925 is about 4449.8230301890. The cubic root of 19800925 is about 270.5381356938.

Subtracting from 19800925 its sum of digits (34), we obtain a palindrome (19800891).

The spelling of 19800925 in words is "nineteen million, eight hundred thousand, nine hundred twenty-five".