20002220081 has 2 divisors, whose sum is σ = 20002220082. Its totient is φ = 20002220080.

The previous prime is 20002220057. The next prime is 20002220123. The reversal of 20002220081 is 18002220002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11182005025 + 8820215056 = 105745^2 + 93916^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20002220081 is a prime.

It is a super-2 number, since 2×20002220081² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20002222081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001110040 + 10001110041.

It is an arithmetic number, because the mean of its divisors is an integer number (10001110041).

Almost surely, 2^20002220081 is an apocalyptic number.

It is an amenable number.

20002220081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002220081 is an equidigital number, since it uses as much as digits as its factorization.

20002220081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20002220081 its reverse (18002220002), we get a palindrome (38004440083).

The spelling of 20002220081 in words is "twenty billion, two million, two hundred twenty thousand, eighty-one".