20320661033 has 4 divisors (see below), whose sum is σ = 20332470228. Its totient is φ = 20308851840.

The previous prime is 20320661029. The next prime is 20320661057. The reversal of 20320661033 is 33016602302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7608549529 + 12712111504 = 87227^2 + 112748^2 .

It is a cyclic number.

It is not a de Polignac number, because 20320661033 - 2² = 20320661029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20320660993 and 20320661011.

It is not an unprimeable number, because it can be changed into a prime (20320661093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5902016 + ... + 5905457.

It is an arithmetic number, because the mean of its divisors is an integer number (5083117557).

Almost surely, 2^20320661033 is an apocalyptic number.

It is an amenable number.

20320661033 is a deficient number, since it is larger than the sum of its proper divisors (11809195).

20320661033 is a wasteful number, since it uses less digits than its factorization.

20320661033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11809194.

The product of its (nonzero) digits is 3888, while the sum is 26.

The spelling of 20320661033 in words is "twenty billion, three hundred twenty million, six hundred sixty-one thousand, thirty-three".