20044391 has 4 divisors (see below), whose sum is σ = 20069400. Its totient is φ = 20019384.

The previous prime is 20044379. The next prime is 20044393. The reversal of 20044391 is 19344002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20044391 is a prime.

It is a super-2 number, since 2×20044391² = 803555221121762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20044393) 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, 11261 + ... + 12918.

It is an arithmetic number, because the mean of its divisors is an integer number (5017350).

Almost surely, 2^20044391 is an apocalyptic number.

20044391 is a deficient number, since it is larger than the sum of its proper divisors (25009).

20044391 is an equidigital number, since it uses as much as digits as its factorization.

20044391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25008.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20044391 is about 4477.0962687885. The cubic root of 20044391 is about 271.6424394485.

Adding to 20044391 its reverse (19344002), we get a palindrome (39388393).

The spelling of 20044391 in words is "twenty million, forty-four thousand, three hundred ninety-one".