20713271 has 4 divisors (see below), whose sum is σ = 21613872. Its totient is φ = 19812672.

The previous prime is 20713261. The next prime is 20713289. The reversal of 20713271 is 17231702.

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 20713271 - 2⁶ = 20713207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 900577 = 20713271 / (2 + 0 + 7 + 1 + 3 + 2 + 7 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20713201) 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, 450266 + ... + 450311.

It is an arithmetic number, because the mean of its divisors is an integer number (5403468).

Almost surely, 2^20713271 is an apocalyptic number.

20713271 is a deficient number, since it is larger than the sum of its proper divisors (900601).

20713271 is an equidigital number, since it uses as much as digits as its factorization.

20713271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900600.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 20713271 is about 4551.1834724608. The cubic root of 20713271 is about 274.6310026182.

Adding to 20713271 its reverse (17231702), we get a palindrome (37944973).

The spelling of 20713271 in words is "twenty million, seven hundred thirteen thousand, two hundred seventy-one".