20634861941 has 2 divisors, whose sum is σ = 20634861942. Its totient is φ = 20634861940.

The previous prime is 20634861937. The next prime is 20634862009. The reversal of 20634861941 is 14916843602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16003515025 + 4631346916 = 126505^2 + 68054^2 .

It is a cyclic number.

It is not a de Polignac number, because 20634861941 - 2² = 20634861937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20634861892 and 20634861901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20634861911) 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, 10317430970 + 10317430971.

It is an arithmetic number, because the mean of its divisors is an integer number (10317430971).

Almost surely, 2^20634861941 is an apocalyptic number.

It is an amenable number.

20634861941 is a deficient number, since it is larger than the sum of its proper divisors (1).

20634861941 is an equidigital number, since it uses as much as digits as its factorization.

20634861941 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 20634861941 in words is "twenty billion, six hundred thirty-four million, eight hundred sixty-one thousand, nine hundred forty-one".