20001820001 has 2 divisors, whose sum is σ = 20001820002. Its totient is φ = 20001820000.

The previous prime is 20001819997. The next prime is 20001820051. The reversal of 20001820001 is 10002810002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11379768976 + 8622051025 = 106676^2 + 92855^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001820001 - 2² = 20001819997 is a prime.

It is not a weakly prime, because it can be changed into another prime (20001820051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000910000 + 10000910001.

It is an arithmetic number, because the mean of its divisors is an integer number (10000910001).

Almost surely, 2^20001820001 is an apocalyptic number.

It is an amenable number.

20001820001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001820001 is an equidigital number, since it uses as much as digits as its factorization.

20001820001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

Subtracting from 20001820001 its reverse (10002810002), we obtain a palindrome (9999009999).

The spelling of 20001820001 in words is "twenty billion, one million, eight hundred twenty thousand, one".