20305406651 has 2 divisors, whose sum is σ = 20305406652. Its totient is φ = 20305406650.

The previous prime is 20305406621. The next prime is 20305406699. The reversal of 20305406651 is 15660450302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20305406651 - 2¹⁴ = 20305390267 is a prime.

It is not a weakly prime, because it can be changed into another prime (20305406621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10152703325 + 10152703326.

It is an arithmetic number, because the mean of its divisors is an integer number (10152703326).

Almost surely, 2^20305406651 is an apocalyptic number.

20305406651 is a deficient number, since it is larger than the sum of its proper divisors (1).

20305406651 is an equidigital number, since it uses as much as digits as its factorization.

20305406651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 32.

Adding to 20305406651 its reverse (15660450302), we get a palindrome (35965856953).

The spelling of 20305406651 in words is "twenty billion, three hundred five million, four hundred six thousand, six hundred fifty-one".