19985066 has 4 divisors (see below), whose sum is σ = 29977602. Its totient is φ = 9992532.

The previous prime is 19985051. The next prime is 19985071. The reversal of 19985066 is 66058991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19936225 + 48841 = 4465^2 + 221^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4996265 + ... + 4996268.

Almost surely, 2^19985066 is an apocalyptic number.

19985066 is a deficient number, since it is larger than the sum of its proper divisors (9992536).

19985066 is an equidigital number, since it uses as much as digits as its factorization.

19985066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9992535.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 19985066 is about 4470.4659712383. The cubic root of 19985066 is about 271.3741829819.

The spelling of 19985066 in words is "nineteen million, nine hundred eighty-five thousand, sixty-six".