20653271 has 2 divisors, whose sum is σ = 20653272. Its totient is φ = 20653270.

The previous prime is 20653267. The next prime is 20653309. The reversal of 20653271 is 17235602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20653271 - 2² = 20653267 is a prime.

It is a Chen prime.

It is equal to p_1309364 and since 20653271 and 1309364 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20653271.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20652271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10326635 + 10326636.

It is an arithmetic number, because the mean of its divisors is an integer number (10326636).

Almost surely, 2^20653271 is an apocalyptic number.

20653271 is a deficient number, since it is larger than the sum of its proper divisors (1).

20653271 is an equidigital number, since it uses as much as digits as its factorization.

20653271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 20653271 is about 4544.5869999374. The cubic root of 20653271 is about 274.3655722049.

Adding to 20653271 its reverse (17235602), we get a palindrome (37888873).

The spelling of 20653271 in words is "twenty million, six hundred fifty-three thousand, two hundred seventy-one".