20334991 has 4 divisors (see below), whose sum is σ = 20346912. Its totient is φ = 20323072.

The previous prime is 20334989. The next prime is 20335031. The reversal of 20334991 is 19943302.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20334991 - 2¹ = 20334989 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 (20334901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2866 + ... + 6991.

It is an arithmetic number, because the mean of its divisors is an integer number (5086728).

Almost surely, 2^20334991 is an apocalyptic number.

20334991 is a deficient number, since it is larger than the sum of its proper divisors (11921).

20334991 is an equidigital number, since it uses as much as digits as its factorization.

20334991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11920.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 20334991 is about 4509.4335564459. The cubic root of 20334991 is about 272.9488872810.

The spelling of 20334991 in words is "twenty million, three hundred thirty-four thousand, nine hundred ninety-one".