20011220027 has 2 divisors, whose sum is σ = 20011220028. Its totient is φ = 20011220026.

The previous prime is 20011219997. The next prime is 20011220029. The reversal of 20011220027 is 72002211002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20011220027 - 2¹⁶ = 20011154491 is a prime.

Together with 20011220029, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20011219987 and 20011220014.

It is not a weakly prime, because it can be changed into another prime (20011220029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005610013 + 10005610014.

It is an arithmetic number, because the mean of its divisors is an integer number (10005610014).

Almost surely, 2^20011220027 is an apocalyptic number.

20011220027 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011220027 is an equidigital number, since it uses as much as digits as its factorization.

20011220027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 17.

Adding to 20011220027 its reverse (72002211002), we get a palindrome (92013431029).

The spelling of 20011220027 in words is "twenty billion, eleven million, two hundred twenty thousand, twenty-seven".