20220220081 has 2 divisors, whose sum is σ = 20220220082. Its totient is φ = 20220220080.

The previous prime is 20220220049. The next prime is 20220220091. The reversal of 20220220081 is 18002202202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20146963600 + 73256481 = 141940^2 + 8559^2 .

It is a cyclic number.

It is not a de Polignac number, because 20220220081 - 2⁵ = 20220220049 is a prime.

It is a super-2 number, since 2×20220220081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20220220091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110110040 + 10110110041.

It is an arithmetic number, because the mean of its divisors is an integer number (10110110041).

Almost surely, 2^20220220081 is an apocalyptic number.

It is an amenable number.

20220220081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20220220081 is an equidigital number, since it uses as much as digits as its factorization.

20220220081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 20220220081 its reverse (18002202202), we get a palindrome (38222422283).

The spelling of 20220220081 in words is "twenty billion, two hundred twenty million, two hundred twenty thousand, eighty-one".