20424302309 has 2 divisors, whose sum is σ = 20424302310. Its totient is φ = 20424302308.

The previous prime is 20424302303. The next prime is 20424302341. The reversal of 20424302309 is 90320342402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11597136100 + 8827166209 = 107690^2 + 93953^2 .

It is a cyclic number.

It is not a de Polignac number, because 20424302309 - 2⁸ = 20424302053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20424302303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212151154 + 10212151155.

It is an arithmetic number, because the mean of its divisors is an integer number (10212151155).

Almost surely, 2^20424302309 is an apocalyptic number.

It is an amenable number.

20424302309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20424302309 is an equidigital number, since it uses as much as digits as its factorization.

20424302309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 29.

The spelling of 20424302309 in words is "twenty billion, four hundred twenty-four million, three hundred two thousand, three hundred nine".