20628271 has 2 divisors, whose sum is σ = 20628272. Its totient is φ = 20628270.

The previous prime is 20628247. The next prime is 20628287. The reversal of 20628271 is 17282602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20628271 - 2⁷ = 20628143 is a prime.

It is a super-3 number, since 3×20628271³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20628211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10314135 + 10314136.

It is an arithmetic number, because the mean of its divisors is an integer number (10314136).

Almost surely, 2^20628271 is an apocalyptic number.

20628271 is a deficient number, since it is larger than the sum of its proper divisors (1).

20628271 is an equidigital number, since it uses as much as digits as its factorization.

20628271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 20628271 is about 4541.8356421165. The cubic root of 20628271 is about 274.2548244733.

The spelling of 20628271 in words is "twenty million, six hundred twenty-eight thousand, two hundred seventy-one".