20716427 has 4 divisors (see below), whose sum is σ = 20823960. Its totient is φ = 20608896.

The previous prime is 20716417. The next prime is 20716429. The reversal of 20716427 is 72461702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20716427 - 2¹² = 20712331 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20716427.

It is not an unprimeable number, because it can be changed into a prime (20716429) 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, 53477 + ... + 53862.

It is an arithmetic number, because the mean of its divisors is an integer number (5205990).

Almost surely, 2^20716427 is an apocalyptic number.

20716427 is a deficient number, since it is larger than the sum of its proper divisors (107533).

20716427 is a wasteful number, since it uses less digits than its factorization.

20716427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107532.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 20716427 is about 4551.5301822574. The cubic root of 20716427 is about 274.6449500601.

The spelling of 20716427 in words is "twenty million, seven hundred sixteen thousand, four hundred twenty-seven".