20220647 has 2 divisors, whose sum is σ = 20220648. Its totient is φ = 20220646.

The previous prime is 20220643. The next prime is 20220653. The reversal of 20220647 is 74602202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20220647 - 2² = 20220643 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 (20220643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110323 + 10110324.

It is an arithmetic number, because the mean of its divisors is an integer number (10110324).

Almost surely, 2^20220647 is an apocalyptic number.

20220647 is a deficient number, since it is larger than the sum of its proper divisors (1).

20220647 is an equidigital number, since it uses as much as digits as its factorization.

20220647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 20220647 is about 4496.7373728071. The cubic root of 20220647 is about 272.4363266206.

Adding to 20220647 its reverse (74602202), we get a palindrome (94822849).

The spelling of 20220647 in words is "twenty million, two hundred twenty thousand, six hundred forty-seven".