20261312633 has 2 divisors, whose sum is σ = 20261312634. Its totient is φ = 20261312632.

The previous prime is 20261312597. The next prime is 20261312647. The reversal of 20261312633 is 33621316202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12634434409 + 7626878224 = 112403^2 + 87332^2 .

It is a cyclic number.

It is not a de Polignac number, because 20261312633 - 2⁸ = 20261312377 is a prime.

It is a super-2 number, since 2×20261312633² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20261312596 and 20261312605.

It is not a weakly prime, because it can be changed into another prime (20261312933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10130656316 + 10130656317.

It is an arithmetic number, because the mean of its divisors is an integer number (10130656317).

Almost surely, 2^20261312633 is an apocalyptic number.

It is an amenable number.

20261312633 is a deficient number, since it is larger than the sum of its proper divisors (1).

20261312633 is an equidigital number, since it uses as much as digits as its factorization.

20261312633 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 29.

Adding to 20261312633 its reverse (33621316202), we get a palindrome (53882628835).

The spelling of 20261312633 in words is "twenty billion, two hundred sixty-one million, three hundred twelve thousand, six hundred thirty-three".