20640321763 has 2 divisors, whose sum is σ = 20640321764. Its totient is φ = 20640321762.

The previous prime is 20640321677. The next prime is 20640321773. The reversal of 20640321763 is 36712304602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20640321763 - 2¹⁷ = 20640190691 is a prime.

It is not a weakly prime, because it can be changed into another prime (20640321773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10320160881 + 10320160882.

It is an arithmetic number, because the mean of its divisors is an integer number (10320160882).

Almost surely, 2^20640321763 is an apocalyptic number.

20640321763 is a deficient number, since it is larger than the sum of its proper divisors (1).

20640321763 is an equidigital number, since it uses as much as digits as its factorization.

20640321763 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 34.

The spelling of 20640321763 in words is "twenty billion, six hundred forty million, three hundred twenty-one thousand, seven hundred sixty-three".