20336721893 has 2 divisors, whose sum is σ = 20336721894. Its totient is φ = 20336721892.

The previous prime is 20336721883. The next prime is 20336721907. The reversal of 20336721893 is 39812763302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10528196449 + 9808525444 = 102607^2 + 99038^2 .

It is a cyclic number.

It is not a de Polignac number, because 20336721893 - 2¹⁰ = 20336720869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20336721883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10168360946 + 10168360947.

It is an arithmetic number, because the mean of its divisors is an integer number (10168360947).

Almost surely, 2^20336721893 is an apocalyptic number.

It is an amenable number.

20336721893 is a deficient number, since it is larger than the sum of its proper divisors (1).

20336721893 is an equidigital number, since it uses as much as digits as its factorization.

20336721893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 44.

The spelling of 20336721893 in words is "twenty billion, three hundred thirty-six million, seven hundred twenty-one thousand, eight hundred ninety-three".