20512224409 has 2 divisors, whose sum is σ = 20512224410. Its totient is φ = 20512224408.

The previous prime is 20512224331. The next prime is 20512224433. The reversal of 20512224409 is 90442221502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19010894400 + 1501330009 = 137880^2 + 38747^2 .

It is a cyclic number.

It is not a de Polignac number, because 20512224409 - 2¹³ = 20512216217 is a prime.

It is not a weakly prime, because it can be changed into another prime (20512224479) 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, 10256112204 + 10256112205.

It is an arithmetic number, because the mean of its divisors is an integer number (10256112205).

Almost surely, 2^20512224409 is an apocalyptic number.

It is an amenable number.

20512224409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20512224409 is an equidigital number, since it uses as much as digits as its factorization.

20512224409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 20512224409 in words is "twenty billion, five hundred twelve million, two hundred twenty-four thousand, four hundred nine".