20716671 has 8 divisors (see below), whose sum is σ = 27643264. Its totient is φ = 13800600.

The previous prime is 20716639. The next prime is 20716673. The reversal of 20716671 is 17661702.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20716671 - 2⁵ = 20716639 is a prime.

It is a super-3 number, since 3×20716671³ (a number of 23 digits) contains 333 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 (20716673) 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, 6300 + ... + 9006.

It is an arithmetic number, because the mean of its divisors is an integer number (3455408).

Almost surely, 2^20716671 is an apocalyptic number.

20716671 is a deficient number, since it is larger than the sum of its proper divisors (6926593).

20716671 is a wasteful number, since it uses less digits than its factorization.

20716671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5261.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 20716671 is about 4551.5569863509. The cubic root of 20716671 is about 274.6460283204.

The spelling of 20716671 in words is "twenty million, seven hundred sixteen thousand, six hundred seventy-one".