20992271 has 2 divisors, whose sum is σ = 20992272. Its totient is φ = 20992270.

The previous prime is 20992267. The next prime is 20992289. The reversal of 20992271 is 17229902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20992271 - 2² = 20992267 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20992291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10496135 + 10496136.

It is an arithmetic number, because the mean of its divisors is an integer number (10496136).

Almost surely, 2^20992271 is an apocalyptic number.

20992271 is a deficient number, since it is larger than the sum of its proper divisors (1).

20992271 is an equidigital number, since it uses as much as digits as its factorization.

20992271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 20992271 is about 4581.7323143108. The cubic root of 20992271 is about 275.8585663023.

The spelling of 20992271 in words is "twenty million, nine hundred ninety-two thousand, two hundred seventy-one".