20330561155 has 4 divisors (see below), whose sum is σ = 24396673392. Its totient is φ = 16264448920.

The previous prime is 20330561149. The next prime is 20330561159. The reversal of 20330561155 is 55116503302.

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

It is a de Polignac number, because none of the positive numbers 2^k-20330561155 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20330561159) 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, 2033056111 + ... + 2033056120.

It is an arithmetic number, because the mean of its divisors is an integer number (6099168348).

Almost surely, 2^20330561155 is an apocalyptic number.

20330561155 is a deficient number, since it is larger than the sum of its proper divisors (4066112237).

20330561155 is an equidigital number, since it uses as much as digits as its factorization.

20330561155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4066112236.

The product of its (nonzero) digits is 13500, while the sum is 31.

The spelling of 20330561155 in words is "twenty billion, three hundred thirty million, five hundred sixty-one thousand, one hundred fifty-five".