20402231609 has 2 divisors, whose sum is σ = 20402231610. Its totient is φ = 20402231608.

The previous prime is 20402231599. The next prime is 20402231617. The reversal of 20402231609 is 90613220402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20401837225 + 394384 = 142835^2 + 628^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20402231609 is a prime.

It is not a weakly prime, because it can be changed into another prime (20402231669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201115804 + 10201115805.

It is an arithmetic number, because the mean of its divisors is an integer number (10201115805).

Almost surely, 2^20402231609 is an apocalyptic number.

It is an amenable number.

20402231609 is a deficient number, since it is larger than the sum of its proper divisors (1).

20402231609 is an equidigital number, since it uses as much as digits as its factorization.

20402231609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 20402231609 in words is "twenty billion, four hundred two million, two hundred thirty-one thousand, six hundred nine".