20039645 has 8 divisors (see below), whose sum is σ = 24455520. Its totient is φ = 15759760.

The previous prime is 20039641. The next prime is 20039687. The reversal of 20039645 is 54693002.

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

It is not a de Polignac number, because 20039645 - 2² = 20039641 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 33671 + ... + 34260.

It is an arithmetic number, because the mean of its divisors is an integer number (3056940).

Almost surely, 2^20039645 is an apocalyptic number.

It is an amenable number.

20039645 is a deficient number, since it is larger than the sum of its proper divisors (4415875).

20039645 is an equidigital number, since it uses as much as digits as its factorization.

20039645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67995.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 20039645 is about 4476.5662063684. The cubic root of 20039645 is about 271.6209984249.

The spelling of 20039645 in words is "twenty million, thirty-nine thousand, six hundred forty-five".