20771747 has 2 divisors, whose sum is σ = 20771748. Its totient is φ = 20771746.

The previous prime is 20771713. The next prime is 20771797. The reversal of 20771747 is 74717702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20771747 - 2⁶ = 20771683 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20771797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10385873 + 10385874.

It is an arithmetic number, because the mean of its divisors is an integer number (10385874).

Almost surely, 2^20771747 is an apocalyptic number.

20771747 is a deficient number, since it is larger than the sum of its proper divisors (1).

20771747 is an equidigital number, since it uses as much as digits as its factorization.

20771747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19208, while the sum is 35.

The square root of 20771747 is about 4557.6032078276. The cubic root of 20771747 is about 274.8891983375.

The spelling of 20771747 in words is "twenty million, seven hundred seventy-one thousand, seven hundred forty-seven".