20716638 has 8 divisors (see below), whose sum is σ = 41433288. Its totient is φ = 6905544.

The previous prime is 20716627. The next prime is 20716639. The reversal of 20716638 is 83661702.

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

20716638 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 20716599 and 20716608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20716639) 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 3 ways as a sum of consecutive naturals, for example, 1726381 + ... + 1726392.

It is an arithmetic number, because the mean of its divisors is an integer number (5179161).

Almost surely, 2^20716638 is an apocalyptic number.

20716638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20716638 is a wasteful number, since it uses less digits than its factorization.

20716638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3452778.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 20716638 is about 4551.5533612164. The cubic root of 20716638 is about 274.6458824906.

The spelling of 20716638 in words is "twenty million, seven hundred sixteen thousand, six hundred thirty-eight".