20011220029 has 2 divisors, whose sum is σ = 20011220030. Its totient is φ = 20011220028.

The previous prime is 20011220027. The next prime is 20011220051. The reversal of 20011220029 is 92002211002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17115703929 + 2895516100 = 130827^2 + 53810^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011220029 - 2¹ = 20011220027 is a prime.

Together with 20011220027, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20011219988 and 20011220015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20011220027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005610014 + 10005610015.

It is an arithmetic number, because the mean of its divisors is an integer number (10005610015).

Almost surely, 2^20011220029 is an apocalyptic number.

It is an amenable number.

20011220029 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011220029 is an equidigital number, since it uses as much as digits as its factorization.

20011220029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The spelling of 20011220029 in words is "twenty billion, eleven million, two hundred twenty thousand, twenty-nine".