20203220281 has 2 divisors, whose sum is σ = 20203220282. Its totient is φ = 20203220280.

The previous prime is 20203220269. The next prime is 20203220299. The reversal of 20203220281 is 18202230202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16501714681 + 3701505600 = 128459^2 + 60840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20203220281 is a prime.

It is a super-2 number, since 2×20203220281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20203220981) 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, 10101610140 + 10101610141.

It is an arithmetic number, because the mean of its divisors is an integer number (10101610141).

Almost surely, 2^20203220281 is an apocalyptic number.

It is an amenable number.

20203220281 is a deficient number, since it is larger than the sum of its proper divisors (1).

20203220281 is an equidigital number, since it uses as much as digits as its factorization.

20203220281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 20203220281 its reverse (18202230202), we get a palindrome (38405450483).

The spelling of 20203220281 in words is "twenty billion, two hundred three million, two hundred twenty thousand, two hundred eighty-one".