20356744633 has 2 divisors, whose sum is σ = 20356744634. Its totient is φ = 20356744632.

The previous prime is 20356744631. The next prime is 20356744637. The reversal of 20356744633 is 33644765302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13421685904 + 6935058729 = 115852^2 + 83277^2 .

It is a cyclic number.

It is not a de Polignac number, because 20356744633 - 2¹ = 20356744631 is a prime.

Together with 20356744631, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20356744633.

It is not a weakly prime, because it can be changed into another prime (20356744631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10178372316 + 10178372317.

It is an arithmetic number, because the mean of its divisors is an integer number (10178372317).

Almost surely, 2^20356744633 is an apocalyptic number.

It is an amenable number.

20356744633 is a deficient number, since it is larger than the sum of its proper divisors (1).

20356744633 is an equidigital number, since it uses as much as digits as its factorization.

20356744633 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 43.

The spelling of 20356744633 in words is "twenty billion, three hundred fifty-six million, seven hundred forty-four thousand, six hundred thirty-three".