20682021 has 8 divisors (see below), whose sum is σ = 28162944. Its totient is φ = 13494560.

The previous prime is 20682019. The next prime is 20682043. The reversal of 20682021 is 12028602.

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 20682021 - 2¹ = 20682019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20682071) 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 7 ways as a sum of consecutive naturals, for example, 73200 + ... + 73481.

It is an arithmetic number, because the mean of its divisors is an integer number (3520368).

Almost surely, 2^20682021 is an apocalyptic number.

It is an amenable number.

20682021 is a deficient number, since it is larger than the sum of its proper divisors (7480923).

20682021 is a wasteful number, since it uses less digits than its factorization.

20682021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146731.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 20682021 is about 4547.7490036281. The cubic root of 20682021 is about 274.4928216676.

The spelling of 20682021 in words is "twenty million, six hundred eighty-two thousand, twenty-one".