20306771 has 2 divisors, whose sum is σ = 20306772. Its totient is φ = 20306770.

The previous prime is 20306761. The next prime is 20306777. The reversal of 20306771 is 17760302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20306771 - 2¹⁸ = 20044627 is a prime.

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 20306771.

It is not a weakly prime, because it can be changed into another prime (20306777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10153385 + 10153386.

It is an arithmetic number, because the mean of its divisors is an integer number (10153386).

Almost surely, 2^20306771 is an apocalyptic number.

20306771 is a deficient number, since it is larger than the sum of its proper divisors (1).

20306771 is an equidigital number, since it uses as much as digits as its factorization.

20306771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764, while the sum is 26.

The square root of 20306771 is about 4506.3034740239. The cubic root of 20306771 is about 272.8225667027.

The spelling of 20306771 in words is "twenty million, three hundred six thousand, seven hundred seventy-one".