20994013 has 4 divisors (see below), whose sum is σ = 21259840. Its totient is φ = 20728188.

The previous prime is 20994011. The next prime is 20994023. The reversal of 20994013 is 31049902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20994013 - 2¹ = 20994011 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 (20994011) 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, 132795 + ... + 132952.

It is an arithmetic number, because the mean of its divisors is an integer number (5314960).

Almost surely, 2^20994013 is an apocalyptic number.

It is an amenable number.

20994013 is a deficient number, since it is larger than the sum of its proper divisors (265827).

20994013 is an equidigital number, since it uses as much as digits as its factorization.

20994013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265826.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 20994013 is about 4581.9224131362. The cubic root of 20994013 is about 275.8661966080.

The spelling of 20994013 in words is "twenty million, nine hundred ninety-four thousand, thirteen".