20644653343 has 2 divisors, whose sum is σ = 20644653344. Its totient is φ = 20644653342.

The previous prime is 20644653209. The next prime is 20644653353. The reversal of 20644653343 is 34335644602.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20644653343 - 2²¹ = 20642556191 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20644653296 and 20644653305.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20644653353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10322326671 + 10322326672.

It is an arithmetic number, because the mean of its divisors is an integer number (10322326672).

Almost surely, 2^20644653343 is an apocalyptic number.

20644653343 is a deficient number, since it is larger than the sum of its proper divisors (1).

20644653343 is an equidigital number, since it uses as much as digits as its factorization.

20644653343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 622080, while the sum is 40.

The spelling of 20644653343 in words is "twenty billion, six hundred forty-four million, six hundred fifty-three thousand, three hundred forty-three".