20426743 has 2 divisors, whose sum is σ = 20426744. Its totient is φ = 20426742.

The previous prime is 20426719. The next prime is 20426761. The reversal of 20426743 is 34762402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20426743 - 2⁵ = 20426711 is a prime.

It is equal to p_1295920 and since 20426743 and 1295920 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20426713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10213371 + 10213372.

It is an arithmetic number, because the mean of its divisors is an integer number (10213372).

Almost surely, 2^20426743 is an apocalyptic number.

20426743 is a deficient number, since it is larger than the sum of its proper divisors (1).

20426743 is an equidigital number, since it uses as much as digits as its factorization.

20426743 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 28.

The square root of 20426743 is about 4519.5954464974. The cubic root of 20426743 is about 273.3587888580.

The spelling of 20426743 in words is "twenty million, four hundred twenty-six thousand, seven hundred forty-three".