20773217 has 2 divisors, whose sum is σ = 20773218. Its totient is φ = 20773216.

The previous prime is 20773199. The next prime is 20773219. The reversal of 20773217 is 71237702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16777216 + 3996001 = 4096^2 + 1999^2 .

It is a cyclic number.

It is not a de Polignac number, because 20773217 - 2⁶ = 20773153 is a prime.

Together with 20773219, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20773217.

It is not a weakly prime, because it can be changed into another prime (20773219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10386608 + 10386609.

It is an arithmetic number, because the mean of its divisors is an integer number (10386609).

Almost surely, 2^20773217 is an apocalyptic number.

It is an amenable number.

20773217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20773217 is an equidigital number, since it uses as much as digits as its factorization.

20773217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4116, while the sum is 29.

The square root of 20773217 is about 4557.7644739499. The cubic root of 20773217 is about 274.8956827478.

The spelling of 20773217 in words is "twenty million, seven hundred seventy-three thousand, two hundred seventeen".