20687343 has 8 divisors (see below), whose sum is σ = 28224768. Its totient is φ = 13470744.

The previous prime is 20687339. The next prime is 20687363. The reversal of 20687343 is 34378602.

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

It is not a de Polignac number, because 20687343 - 2² = 20687339 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20687363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80055 + ... + 80312.

It is an arithmetic number, because the mean of its divisors is an integer number (3528096).

Almost surely, 2^20687343 is an apocalyptic number.

20687343 is a deficient number, since it is larger than the sum of its proper divisors (7537425).

20687343 is a wasteful number, since it uses less digits than its factorization.

20687343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160413.

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 20687343 is about 4548.3340906314. The cubic root of 20687343 is about 274.5163642654.

The spelling of 20687343 in words is "twenty million, six hundred eighty-seven thousand, three hundred forty-three".