19985650 has 24 divisors (see below), whose sum is σ = 37380420. Its totient is φ = 7949760.

The previous prime is 19985627. The next prime is 19985671. The reversal of 19985650 is 5658991.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 18688329 + 1297321 = 4323^2 + 1139^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19985597 and 19985606.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 8836 + ... + 10864.

Almost surely, 2^19985650 is an apocalyptic number.

19985650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19985650 is a deficient number, since it is larger than the sum of its proper divisors (17394770).

19985650 is a wasteful number, since it uses less digits than its factorization.

19985650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2238 (or 2233 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 43.

The square root of 19985650 is about 4470.5312883370. The cubic root of 19985650 is about 271.3768263053.

It can be divided in two parts, 199 and 85650, that added together give a square (85849 = 293²).

The spelling of 19985650 in words is "nineteen million, nine hundred eighty-five thousand, six hundred fifty".