20426647 has 2 divisors, whose sum is σ = 20426648. Its totient is φ = 20426646.

The previous prime is 20426633. The next prime is 20426689. The reversal of 20426647 is 74662402.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20426647 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 (20426447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10213323 + 10213324.

It is an arithmetic number, because the mean of its divisors is an integer number (10213324).

Almost surely, 2^20426647 is an apocalyptic number.

20426647 is a deficient number, since it is larger than the sum of its proper divisors (1).

20426647 is an equidigital number, since it uses as much as digits as its factorization.

20426647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 20426647 is about 4519.5848260653. The cubic root of 20426647 is about 273.3583606206.

The spelling of 20426647 in words is "twenty million, four hundred twenty-six thousand, six hundred forty-seven".