20620469 has 2 divisors, whose sum is σ = 20620470. Its totient is φ = 20620468.

The previous prime is 20620429. The next prime is 20620477. The reversal of 20620469 is 96402602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20584369 + 36100 = 4537^2 + 190^2 .

It is a cyclic number.

It is not a de Polignac number, because 20620469 - 2¹² = 20616373 is a prime.

It is a super-2 number, since 2×20620469² = 850407483559922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20620429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10310234 + 10310235.

It is an arithmetic number, because the mean of its divisors is an integer number (10310235).

Almost surely, 2^20620469 is an apocalyptic number.

It is an amenable number.

20620469 is a deficient number, since it is larger than the sum of its proper divisors (1).

20620469 is an equidigital number, since it uses as much as digits as its factorization.

20620469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 20620469 is about 4540.9766570640. The cubic root of 20620469 is about 274.2202440026.

The spelling of 20620469 in words is "twenty million, six hundred twenty thousand, four hundred sixty-nine".