20320661029 has 2 divisors, whose sum is σ = 20320661030. Its totient is φ = 20320661028.

The previous prime is 20320661027. The next prime is 20320661057. The reversal of 20320661029 is 92016602302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17336988900 + 2983672129 = 131670^2 + 54623^2 .

It is a cyclic number.

It is not a de Polignac number, because 20320661029 - 2¹ = 20320661027 is a prime.

Together with 20320661027, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20320661027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160330514 + 10160330515.

It is an arithmetic number, because the mean of its divisors is an integer number (10160330515).

Almost surely, 2^20320661029 is an apocalyptic number.

It is an amenable number.

20320661029 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320661029 is an equidigital number, since it uses as much as digits as its factorization.

20320661029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 31.

The spelling of 20320661029 in words is "twenty billion, three hundred twenty million, six hundred sixty-one thousand, twenty-nine".