20687271 has 8 divisors (see below), whose sum is σ = 30090624. Its totient is φ = 12537720.

The previous prime is 20687269. The next prime is 20687279. The reversal of 20687271 is 17278602.

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

It is not a de Polignac number, because 20687271 - 2¹ = 20687269 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 626887 = 20687271 / (2 + 0 + 6 + 8 + 7 + 2 + 7 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20687279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 313411 + ... + 313476.

It is an arithmetic number, because the mean of its divisors is an integer number (3761328).

Almost surely, 2^20687271 is an apocalyptic number.

20687271 is a deficient number, since it is larger than the sum of its proper divisors (9403353).

20687271 is a wasteful number, since it uses less digits than its factorization.

20687271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626901.

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 20687271 is about 4548.3261756387. The cubic root of 20687271 is about 274.5160457905.

It can be divided in two parts, 2068 and 7271, that added together give a palindrome (9339).

The spelling of 20687271 in words is "twenty million, six hundred eighty-seven thousand, two hundred seventy-one".