20684671 has 8 divisors (see below), whose sum is σ = 23813280. Its totient is φ = 17599488.

The previous prime is 20684669. The next prime is 20684693. The reversal of 20684671 is 17648602.

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 20684671 - 2¹ = 20684669 is a prime.

It is a super-2 number, since 2×20684671² = 855711228756482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20684611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9826 + ... + 11743.

It is an arithmetic number, because the mean of its divisors is an integer number (2976660).

Almost surely, 2^20684671 is an apocalyptic number.

20684671 is a deficient number, since it is larger than the sum of its proper divisors (3128609).

20684671 is a wasteful number, since it uses less digits than its factorization.

20684671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21713.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 20684671 is about 4548.0403472265. The cubic root of 20684671 is about 274.5045448112.

The spelling of 20684671 in words is "twenty million, six hundred eighty-four thousand, six hundred seventy-one".