20020241809 has 2 divisors, whose sum is σ = 20020241810. Its totient is φ = 20020241808.

The previous prime is 20020241789. The next prime is 20020241837. The reversal of 20020241809 is 90814202002.

It is an a-pointer prime, because the next prime (20020241837) can be obtained adding 20020241809 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19180865025 + 839376784 = 138495^2 + 28972^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20020241809 is a prime.

It is not a weakly prime, because it can be changed into another prime (20020241869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010120904 + 10010120905.

It is an arithmetic number, because the mean of its divisors is an integer number (10010120905).

Almost surely, 2^20020241809 is an apocalyptic number.

It is an amenable number.

20020241809 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020241809 is an equidigital number, since it uses as much as digits as its factorization.

20020241809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The spelling of 20020241809 in words is "twenty billion, twenty million, two hundred forty-one thousand, eight hundred nine".