20687241 has 8 divisors (see below), whose sum is σ = 27851200. Its totient is φ = 13657392.

The previous prime is 20687207. The next prime is 20687243. The reversal of 20687241 is 14278602.

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

It is not a de Polignac number, because 20687241 - 2²² = 16492937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20687199 and 20687208.

It is not an unprimeable number, because it can be changed into a prime (20687243) 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 7 ways as a sum of consecutive naturals, for example, 33166 + ... + 33783.

It is an arithmetic number, because the mean of its divisors is an integer number (3481400).

Almost surely, 2^20687241 is an apocalyptic number.

It is an amenable number.

20687241 is a deficient number, since it is larger than the sum of its proper divisors (7163959).

20687241 is a wasteful number, since it uses less digits than its factorization.

20687241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67055.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 20687241 is about 4548.3228777210. The cubic root of 20687241 is about 274.5159130924.

The spelling of 20687241 in words is "twenty million, six hundred eighty-seven thousand, two hundred forty-one".