20020220012081 has 2 divisors, whose sum is σ = 20020220012082. Its totient is φ = 20020220012080.

The previous prime is 20020220012077. The next prime is 20020220012251. The reversal of 20020220012081 is 18021002202002.

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., 19117357075600 + 902862936481 = 4372340^2 + 950191^2 .

It is a cyclic number.

It is not a de Polignac number, because 20020220012081 - 2² = 20020220012077 is a prime.

It is a super-2 number, since 2×20020220012081² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20020220012011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010110006040 + 10010110006041.

It is an arithmetic number, because the mean of its divisors is an integer number (10010110006041).

Almost surely, 2^{20020220012081} is an apocalyptic number.

It is an amenable number.

20020220012081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020220012081 is an equidigital number, since it uses as much as digits as its factorization.

20020220012081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 20020220012081 its reverse (18021002202002), we get a palindrome (38041222214083).

The spelling of 20020220012081 in words is "twenty trillion, twenty billion, two hundred twenty million, twelve thousand, eighty-one".