20608687 has 4 divisors (see below), whose sum is σ = 22482216. Its totient is φ = 18735160.

The previous prime is 20608681. The next prime is 20608723. The reversal of 20608687 is 78680602.

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 20608687 - 2¹⁹ = 20084399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20608681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 936748 + ... + 936769.

It is an arithmetic number, because the mean of its divisors is an integer number (5620554).

Almost surely, 2^20608687 is an apocalyptic number.

20608687 is a deficient number, since it is larger than the sum of its proper divisors (1873529).

20608687 is a wasteful number, since it uses less digits than its factorization.

20608687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1873528.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 20608687 is about 4539.6791736862. The cubic root of 20608687 is about 274.1680066124.

The spelling of 20608687 in words is "twenty million, six hundred eight thousand, six hundred eighty-seven".