20716642 has 8 divisors (see below), whose sum is σ = 32902956. Its totient is φ = 9748992.

The previous prime is 20716639. The next prime is 20716673. The reversal of 20716642 is 24661702.

It can be written as a sum of positive squares in 2 ways, for example, as 20711601 + 5041 = 4551^2 + 71^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 20716642.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304623 + ... + 304690.

Almost surely, 2^20716642 is an apocalyptic number.

20716642 is a deficient number, since it is larger than the sum of its proper divisors (12186314).

20716642 is a wasteful number, since it uses less digits than its factorization.

20716642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609332.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20716642 is about 4551.5538006268. The cubic root of 20716642 is about 274.6459001670.

The spelling of 20716642 in words is "twenty million, seven hundred sixteen thousand, six hundred forty-two".