20969017 has 2 divisors, whose sum is σ = 20969018. Its totient is φ = 20969016.

The previous prime is 20969009. The next prime is 20969029. The reversal of 20969017 is 71096902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20939776 + 29241 = 4576^2 + 171^2 .

It is a cyclic number.

It is not a de Polignac number, because 20969017 - 2³ = 20969009 is a prime.

It is not a weakly prime, because it can be changed into another prime (20969087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10484508 + 10484509.

It is an arithmetic number, because the mean of its divisors is an integer number (10484509).

Almost surely, 2^20969017 is an apocalyptic number.

It is an amenable number.

20969017 is a deficient number, since it is larger than the sum of its proper divisors (1).

20969017 is an equidigital number, since it uses as much as digits as its factorization.

20969017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 20969017 is about 4579.1939246990. The cubic root of 20969017 is about 275.7566687165.

The spelling of 20969017 in words is "twenty million, nine hundred sixty-nine thousand, seventeen".