20206436291 has 2 divisors, whose sum is σ = 20206436292. Its totient is φ = 20206436290.

The previous prime is 20206436287. The next prime is 20206436297. The reversal of 20206436291 is 19263460202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20206436291 - 2² = 20206436287 is a prime.

It is not a weakly prime, because it can be changed into another prime (20206436297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10103218145 + 10103218146.

It is an arithmetic number, because the mean of its divisors is an integer number (10103218146).

Almost surely, 2^20206436291 is an apocalyptic number.

20206436291 is a deficient number, since it is larger than the sum of its proper divisors (1).

20206436291 is an equidigital number, since it uses as much as digits as its factorization.

20206436291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 35.

Adding to 20206436291 its reverse (19263460202), we get a palindrome (39469896493).

The spelling of 20206436291 in words is "twenty billion, two hundred six million, four hundred thirty-six thousand, two hundred ninety-one".