20039986 has 8 divisors (see below), whose sum is σ = 31096620. Its totient is φ = 9674448.

The previous prime is 20039983. The next prime is 20039993. The reversal of 20039986 is 68993002.

It can be written as a sum of positive squares in 2 ways, for example, as 19758025 + 281961 = 4445^2 + 531^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20039983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172701 + ... + 172816.

Almost surely, 2^20039986 is an apocalyptic number.

20039986 is a deficient number, since it is larger than the sum of its proper divisors (11056634).

20039986 is a wasteful number, since it uses less digits than its factorization.

20039986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345548.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 20039986 is about 4476.6042934349. The cubic root of 20039986 is about 271.6225390749.

It can be divided in two parts, 20039 and 986, that added together give a square (21025 = 145²).

The spelling of 20039986 in words is "twenty million, thirty-nine thousand, nine hundred eighty-six".