20994359 has 4 divisors (see below), whose sum is σ = 21021120. Its totient is φ = 20967600.

The previous prime is 20994349. The next prime is 20994367. The reversal of 20994359 is 95349902.

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 20994359 - 2⁴ = 20994343 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 (20994319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12167 + ... + 13784.

It is an arithmetic number, because the mean of its divisors is an integer number (5255280).

Almost surely, 2^20994359 is an apocalyptic number.

20994359 is a deficient number, since it is larger than the sum of its proper divisors (26761).

20994359 is an equidigital number, since it uses as much as digits as its factorization.

20994359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26760.

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 20994359 is about 4581.9601700582. The cubic root of 20994359 is about 275.8677121064.

The spelling of 20994359 in words is "twenty million, nine hundred ninety-four thousand, three hundred fifty-nine".