20244991 has 8 divisors (see below), whose sum is σ = 22750560. Its totient is φ = 17874912.

The previous prime is 20244989. The next prime is 20245007. The reversal of 20244991 is 19944202.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20244991 - 2¹ = 20244989 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 (20244391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33556 + ... + 34153.

It is an arithmetic number, because the mean of its divisors is an integer number (2843820).

Almost surely, 2^20244991 is an apocalyptic number.

20244991 is a deficient number, since it is larger than the sum of its proper divisors (2505569).

20244991 is a wasteful number, since it uses less digits than its factorization.

20244991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67745.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 20244991 is about 4499.4434100231. The cubic root of 20244991 is about 272.5456131035.

The spelling of 20244991 in words is "twenty million, two hundred forty-four thousand, nine hundred ninety-one".