20962609 has 4 divisors (see below), whose sum is σ = 21529204. Its totient is φ = 20396016.

The previous prime is 20962559. The next prime is 20962631. The reversal of 20962609 is 90626902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90626902 = 2 ⋅45313451.

It can be written as a sum of positive squares in 2 ways, for example, as 15800625 + 5161984 = 3975^2 + 2272^2 .

It is a cyclic number.

It is not a de Polignac number, because 20962609 - 2⁷ = 20962481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20962709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 283242 + ... + 283315.

It is an arithmetic number, because the mean of its divisors is an integer number (5382301).

Almost surely, 2^20962609 is an apocalyptic number.

It is an amenable number.

20962609 is a deficient number, since it is larger than the sum of its proper divisors (566595).

20962609 is an equidigital number, since it uses as much as digits as its factorization.

20962609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566594.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 20962609 is about 4578.4941847730. The cubic root of 20962609 is about 275.7285760188.

The spelling of 20962609 in words is "twenty million, nine hundred sixty-two thousand, six hundred nine".