20430687 has 8 divisors (see below), whose sum is σ = 27495936. Its totient is φ = 13492952.

The previous prime is 20430679. The next prime is 20430691. The reversal of 20430687 is 78603402.

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

It is a cyclic number.

It is not a de Polignac number, because 20430687 - 2³ = 20430679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20430607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31503 + ... + 32144.

It is an arithmetic number, because the mean of its divisors is an integer number (3436992).

Almost surely, 2^20430687 is an apocalyptic number.

20430687 is a deficient number, since it is larger than the sum of its proper divisors (7065249).

20430687 is a wasteful number, since it uses less digits than its factorization.

20430687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63757.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 20430687 is about 4520.0317476761. The cubic root of 20430687 is about 273.3763811174.

The spelling of 20430687 in words is "twenty million, four hundred thirty thousand, six hundred eighty-seven".