20220404081 has 2 divisors, whose sum is σ = 20220404082. Its totient is φ = 20220404080.

The previous prime is 20220404011. The next prime is 20220404093. The reversal of 20220404081 is 18040402202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10112112481 + 10108291600 = 100559^2 + 100540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20220404081 is a prime.

It is a super-2 number, since 2×20220404081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20220404011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110202040 + 10110202041.

It is an arithmetic number, because the mean of its divisors is an integer number (10110202041).

Almost surely, 2^20220404081 is an apocalyptic number.

It is an amenable number.

20220404081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20220404081 is an equidigital number, since it uses as much as digits as its factorization.

20220404081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 20220404081 its reverse (18040402202), we get a palindrome (38260806283).

The spelling of 20220404081 in words is "twenty billion, two hundred twenty million, four hundred four thousand, eighty-one".