19980245 has 16 divisors (see below), whose sum is σ = 24633840. Its totient is φ = 15552000.

The previous prime is 19980241. The next prime is 19980281. The reversal of 19980245 is 54208991.

It can be written as a sum of positive squares in 8 ways, for example, as 142129 + 19838116 = 377^2 + 4454^2 .

It is not a de Polignac number, because 19980245 - 2² = 19980241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19980199 and 19980208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19980241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32945 + ... + 33545.

It is an arithmetic number, because the mean of its divisors is an integer number (1539615).

Almost surely, 2^19980245 is an apocalyptic number.

It is an amenable number.

19980245 is a deficient number, since it is larger than the sum of its proper divisors (4653595).

19980245 is a wasteful number, since it uses less digits than its factorization.

19980245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 19980245 is about 4469.9267331803. The cubic root of 19980245 is about 271.3523600175.

The spelling of 19980245 in words is "nineteen million, nine hundred eighty thousand, two hundred forty-five".