20021220763 has 2 divisors, whose sum is σ = 20021220764. Its totient is φ = 20021220762.

The previous prime is 20021220707. The next prime is 20021220781. The reversal of 20021220763 is 36702212002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20021220763 - 2¹³ = 20021212571 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021220463) 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, 10010610381 + 10010610382.

It is an arithmetic number, because the mean of its divisors is an integer number (10010610382).

Almost surely, 2^20021220763 is an apocalyptic number.

20021220763 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021220763 is an equidigital number, since it uses as much as digits as its factorization.

20021220763 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 25.

Adding to 20021220763 its reverse (36702212002), we get a palindrome (56723432765).

The spelling of 20021220763 in words is "twenty billion, twenty-one million, two hundred twenty thousand, seven hundred sixty-three".