20684213 has 8 divisors (see below), whose sum is σ = 23115456. Its totient is φ = 18344800.

The previous prime is 20684207. The next prime is 20684219. The reversal of 20684213 is 31248602.

It is an interprime number because it is at equal distance from previous prime (20684207) and next prime (20684219).

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 20684213 - 2⁴ = 20684197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20684219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22481 + ... + 23382.

It is an arithmetic number, because the mean of its divisors is an integer number (2889432).

Almost surely, 2^20684213 is an apocalyptic number.

It is an amenable number.

20684213 is a deficient number, since it is larger than the sum of its proper divisors (2431243).

20684213 is a wasteful number, since it uses less digits than its factorization.

20684213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45915.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 20684213 is about 4547.9899955915. The cubic root of 20684213 is about 274.5025187697.

The spelling of 20684213 in words is "twenty million, six hundred eighty-four thousand, two hundred thirteen".