20216369 has 2 divisors, whose sum is σ = 20216370. Its totient is φ = 20216368.

The previous prime is 20216359. The next prime is 20216387. The reversal of 20216369 is 96361202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15108769 + 5107600 = 3887^2 + 2260^2 .

It is a cyclic number.

It is not a de Polignac number, because 20216369 - 2⁴ = 20216353 is a prime.

It is a super-2 number, since 2×20216369² = 817403151088322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20216359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10108184 + 10108185.

It is an arithmetic number, because the mean of its divisors is an integer number (10108185).

Almost surely, 2^20216369 is an apocalyptic number.

It is an amenable number.

20216369 is a deficient number, since it is larger than the sum of its proper divisors (1).

20216369 is an equidigital number, since it uses as much as digits as its factorization.

20216369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 20216369 is about 4496.2616694316. The cubic root of 20216369 is about 272.4171125172.

The spelling of 20216369 in words is "twenty million, two hundred sixteen thousand, three hundred sixty-nine".