20424811609 has 2 divisors, whose sum is σ = 20424811610. Its totient is φ = 20424811608.

The previous prime is 20424811591. The next prime is 20424811651. The reversal of 20424811609 is 90611842402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13070891584 + 7353920025 = 114328^2 + 85755^2 .

It is a cyclic number.

It is not a de Polignac number, because 20424811609 - 2⁹ = 20424811097 is a prime.

It is not a weakly prime, because it can be changed into another prime (20424811709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212405804 + 10212405805.

It is an arithmetic number, because the mean of its divisors is an integer number (10212405805).

Almost surely, 2^20424811609 is an apocalyptic number.

It is an amenable number.

20424811609 is a deficient number, since it is larger than the sum of its proper divisors (1).

20424811609 is an equidigital number, since it uses as much as digits as its factorization.

20424811609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 37.

The spelling of 20424811609 in words is "twenty billion, four hundred twenty-four million, eight hundred eleven thousand, six hundred nine".