20020243409 has 8 divisors (see below), whose sum is σ = 21928867560. Its totient is φ = 18192837376.

The previous prime is 20020243367. The next prime is 20020243417. The reversal of 20020243409 is 90434202002.

It can be written as a sum of positive squares in 4 ways, for example, as 7559433025 + 12460810384 = 86945^2 + 111628^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20020243409 - 2¹⁶ = 20020177873 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20020243429) 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 in 7 ways as a sum of consecutive naturals, for example, 20304014 + ... + 20304999.

It is an arithmetic number, because the mean of its divisors is an integer number (2741108445).

Almost surely, 2^20020243409 is an apocalyptic number.

20020243409 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

20020243409 is a deficient number, since it is larger than the sum of its proper divisors (1908624151).

20020243409 is a wasteful number, since it uses less digits than its factorization.

20020243409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40609059.

The product of its (nonzero) digits is 3456, while the sum is 26.

The spelling of 20020243409 in words is "twenty billion, twenty million, two hundred forty-three thousand, four hundred nine".