20426429 has 2 divisors, whose sum is σ = 20426430. Its totient is φ = 20426428.

The previous prime is 20426423. The next prime is 20426443. The reversal of 20426429 is 92462402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19598329 + 828100 = 4427^2 + 910^2 .

It is a cyclic number.

It is not a de Polignac number, because 20426429 - 2⁸ = 20426173 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 (20426423) 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, 10213214 + 10213215.

It is an arithmetic number, because the mean of its divisors is an integer number (10213215).

Almost surely, 2^20426429 is an apocalyptic number.

It is an amenable number.

20426429 is a deficient number, since it is larger than the sum of its proper divisors (1).

20426429 is an equidigital number, since it uses as much as digits as its factorization.

20426429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 20426429 is about 4519.5607087415. The cubic root of 20426429 is about 273.3573881599.

The spelling of 20426429 in words is "twenty million, four hundred twenty-six thousand, four hundred twenty-nine".