19988245 has 4 divisors (see below), whose sum is σ = 23985900. Its totient is φ = 15990592.

The previous prime is 19988237. The next prime is 19988257. The reversal of 19988245 is 54288991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54288991 = 199 ⋅272809.

It can be written as a sum of positive squares in 2 ways, for example, as 14638276 + 5349969 = 3826^2 + 2313^2 .

It is a cyclic number.

It is not a de Polignac number, because 19988245 - 2³ = 19988237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19988195 and 19988204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1998820 + ... + 1998829.

It is an arithmetic number, because the mean of its divisors is an integer number (5996475).

Almost surely, 2^19988245 is an apocalyptic number.

It is an amenable number.

19988245 is a deficient number, since it is larger than the sum of its proper divisors (3997655).

19988245 is an equidigital number, since it uses as much as digits as its factorization.

19988245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3997654.

The product of its digits is 207360, while the sum is 46.

The square root of 19988245 is about 4470.8215128766. The cubic root of 19988245 is about 271.3885712721.

The spelling of 19988245 in words is "nineteen million, nine hundred eighty-eight thousand, two hundred forty-five".