20944391 has 8 divisors (see below), whose sum is σ = 23882544. Its totient is φ = 18195840.

The previous prime is 20944379. The next prime is 20944393. The reversal of 20944391 is 19344902.

It is a happy number.

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

It is not a de Polignac number, because 20944391 - 2¹⁸ = 20682247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20944393) 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, 47165 + ... + 47606.

It is an arithmetic number, because the mean of its divisors is an integer number (2985318).

Almost surely, 2^20944391 is an apocalyptic number.

20944391 is a deficient number, since it is larger than the sum of its proper divisors (2938153).

20944391 is a wasteful number, since it uses less digits than its factorization.

20944391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94801.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 20944391 is about 4576.5042335827. The cubic root of 20944391 is about 275.6486769458.

The spelling of 20944391 in words is "twenty million, nine hundred forty-four thousand, three hundred ninety-one".