20944471 has 4 divisors (see below), whose sum is σ = 21151944. Its totient is φ = 20737000.

The previous prime is 20944463. The next prime is 20944477. The reversal of 20944471 is 17444902.

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 20944471 - 2³ = 20944463 is a prime.

It is a super-3 number, since 3×20944471³ (a number of 23 digits) contains 333 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 (20944477) 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, 103585 + ... + 103786.

It is an arithmetic number, because the mean of its divisors is an integer number (5287986).

Almost surely, 2^20944471 is an apocalyptic number.

20944471 is a deficient number, since it is larger than the sum of its proper divisors (207473).

20944471 is a wasteful number, since it uses less digits than its factorization.

20944471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207472.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 20944471 is about 4576.5129738700. The cubic root of 20944471 is about 275.6490279048.

The spelling of 20944471 in words is "twenty million, nine hundred forty-four thousand, four hundred seventy-one".