20044691 has 4 divisors (see below), whose sum is σ = 20128800. Its totient is φ = 19960584.

The previous prime is 20044679. The next prime is 20044697. The reversal of 20044691 is 19644002.

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

It is a cyclic number.

It is not a de Polignac number, because 20044691 - 2⁶ = 20044627 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20044691.

It is not an unprimeable number, because it can be changed into a prime (20044697) 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, 41696 + ... + 42173.

It is an arithmetic number, because the mean of its divisors is an integer number (5032200).

Almost surely, 2^20044691 is an apocalyptic number.

20044691 is a deficient number, since it is larger than the sum of its proper divisors (84109).

20044691 is an equidigital number, since it uses as much as digits as its factorization.

20044691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84108.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20044691 is about 4477.1297725217. The cubic root of 20044691 is about 271.6437946460.

Adding to 20044691 its reverse (19644002), we get a palindrome (39688693).

Subtracting from 20044691 its reverse (19644002), we obtain a square (400689 = 633²).

The spelling of 20044691 in words is "twenty million, forty-four thousand, six hundred ninety-one".