20039644 has 12 divisors (see below), whose sum is σ = 36017464. Its totient is φ = 9748944.

The previous prime is 20039641. The next prime is 20039687. The reversal of 20039644 is 44693002.

It is a super-3 number, since 3×20039644³ (a number of 23 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20039641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67554 + ... + 67849.

Almost surely, 2^20039644 is an apocalyptic number.

It is an amenable number.

20039644 is a deficient number, since it is larger than the sum of its proper divisors (15977820).

20039644 is a wasteful number, since it uses less digits than its factorization.

20039644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135444 (or 135442 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 20039644 is about 4476.5660946757. The cubic root of 20039644 is about 271.6209939069.

The spelling of 20039644 in words is "twenty million, thirty-nine thousand, six hundred forty-four".