20442286691 has 2 divisors, whose sum is σ = 20442286692. Its totient is φ = 20442286690.

The previous prime is 20442286663. The next prime is 20442286703. The reversal of 20442286691 is 19668224402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20442286691 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20442286651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221143345 + 10221143346.

It is an arithmetic number, because the mean of its divisors is an integer number (10221143346).

Almost surely, 2^20442286691 is an apocalyptic number.

20442286691 is a deficient number, since it is larger than the sum of its proper divisors (1).

20442286691 is an equidigital number, since it uses as much as digits as its factorization.

20442286691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 331776, while the sum is 44.

The spelling of 20442286691 in words is "twenty billion, four hundred forty-two million, two hundred eighty-six thousand, six hundred ninety-one".