20617469 has 2 divisors, whose sum is σ = 20617470. Its totient is φ = 20617468.

The previous prime is 20617423. The next prime is 20617517. The reversal of 20617469 is 96471602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20593444 + 24025 = 4538^2 + 155^2 .

It is a cyclic number.

It is not a de Polignac number, because 20617469 - 2⁸ = 20617213 is a prime.

It is a super-2 number, since 2×20617469² = 850160055931922, which contains 22 as substring.

It is a Sophie Germain 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 (20617669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10308734 + 10308735.

It is an arithmetic number, because the mean of its divisors is an integer number (10308735).

Almost surely, 2^20617469 is an apocalyptic number.

It is an amenable number.

20617469 is a deficient number, since it is larger than the sum of its proper divisors (1).

20617469 is an equidigital number, since it uses as much as digits as its factorization.

20617469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 20617469 is about 4540.6463196334. The cubic root of 20617469 is about 274.2069449092.

The spelling of 20617469 in words is "twenty million, six hundred seventeen thousand, four hundred sixty-nine".