20416409209 has 4 divisors (see below), whose sum is σ = 23333039104. Its totient is φ = 17499779316.

The previous prime is 20416409203. The next prime is 20416409227. The reversal of 20416409209 is 90290461402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90290461402 = 2 ⋅45145230701.

It is a cyclic number.

It is not a de Polignac number, because 20416409209 - 2³ = 20416409201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20416409201) 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, 1458314937 + ... + 1458314950.

It is an arithmetic number, because the mean of its divisors is an integer number (5833259776).

Almost surely, 2^20416409209 is an apocalyptic number.

It is an amenable number.

20416409209 is a deficient number, since it is larger than the sum of its proper divisors (2916629895).

20416409209 is an equidigital number, since it uses as much as digits as its factorization.

20416409209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2916629894.

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 20416409209 in words is "twenty billion, four hundred sixteen million, four hundred nine thousand, two hundred nine".