20684081 has 8 divisors (see below), whose sum is σ = 22598400. Its totient is φ = 18775440.

The previous prime is 20684071. The next prime is 20684117. The reversal of 20684081 is 18048602.

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 20684081 - 2¹⁰ = 20683057 is a prime.

It is a super-2 number, since 2×20684081² = 855662413629122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20684011) 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, 10880 + ... + 12638.

It is an arithmetic number, because the mean of its divisors is an integer number (2824800).

Almost surely, 2^20684081 is an apocalyptic number.

It is an amenable number.

20684081 is a deficient number, since it is larger than the sum of its proper divisors (1914319).

20684081 is a wasteful number, since it uses less digits than its factorization.

20684081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2839.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 20684081 is about 4547.9754836630. The cubic root of 20684081 is about 274.5019348395.

The spelling of 20684081 in words is "twenty million, six hundred eighty-four thousand, eighty-one".