20205510469 has 2 divisors, whose sum is σ = 20205510470. Its totient is φ = 20205510468.

The previous prime is 20205510467. The next prime is 20205510509. The reversal of 20205510469 is 96401550202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13658596900 + 6546913569 = 116870^2 + 80913^2 .

It is a cyclic number.

It is not a de Polignac number, because 20205510469 - 2¹ = 20205510467 is a prime.

It is a super-2 number, since 2×20205510469² (a number of 21 digits) contains 22 as substring.

Together with 20205510467, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20205510467) 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, 10102755234 + 10102755235.

It is an arithmetic number, because the mean of its divisors is an integer number (10102755235).

Almost surely, 2^20205510469 is an apocalyptic number.

It is an amenable number.

20205510469 is a deficient number, since it is larger than the sum of its proper divisors (1).

20205510469 is an equidigital number, since it uses as much as digits as its factorization.

20205510469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 20205510469 in words is "twenty billion, two hundred five million, five hundred ten thousand, four hundred sixty-nine".