20423271 has 16 divisors (see below), whose sum is σ = 31271040. Its totient is φ = 11725920.

The previous prime is 20423257. The next prime is 20423329. The reversal of 20423271 is 17232402.

It is not a de Polignac number, because 20423271 - 2¹⁰ = 20422247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15660 + ... + 16913.

It is an arithmetic number, because the mean of its divisors is an integer number (1954440).

Almost surely, 2^20423271 is an apocalyptic number.

20423271 is a deficient number, since it is larger than the sum of its proper divisors (10847769).

20423271 is a wasteful number, since it uses less digits than its factorization.

20423271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32606.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20423271 is about 4519.2113249991. The cubic root of 20423271 is about 273.3433000860.

Adding to 20423271 its reverse (17232402), we get a palindrome (37655673).

The spelling of 20423271 in words is "twenty million, four hundred twenty-three thousand, two hundred seventy-one".