20202001081 has 2 divisors, whose sum is σ = 20202001082. Its totient is φ = 20202001080.

The previous prime is 20202001069. The next prime is 20202001103. The reversal of 20202001081 is 18010020202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20081440681 + 120560400 = 141709^2 + 10980^2 .

It is a cyclic number.

It is not a de Polignac number, because 20202001081 - 2⁷ = 20202000953 is a prime.

It is a super-2 number, since 2×20202001081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20202001021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101000540 + 10101000541.

It is an arithmetic number, because the mean of its divisors is an integer number (10101000541).

Almost surely, 2^20202001081 is an apocalyptic number.

It is an amenable number.

20202001081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20202001081 is an equidigital number, since it uses as much as digits as its factorization.

20202001081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20202001081 its reverse (18010020202), we get a palindrome (38212021283).

The spelling of 20202001081 in words is "twenty billion, two hundred two million, one thousand, eighty-one".