20778973233 has 16 divisors (see below), whose sum is σ = 28181442240. Its totient is φ = 13614686144.

The previous prime is 20778973213. The next prime is 20778973279. The reversal of 20778973233 is 33237987702.

It is a cyclic number.

It is not a de Polignac number, because 20778973233 - 2¹⁸ = 20778711089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20778973213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 932935 + ... + 954947.

It is an arithmetic number, because the mean of its divisors is an integer number (1761340140).

Almost surely, 2^20778973233 is an apocalyptic number.

It is an amenable number.

20778973233 is a deficient number, since it is larger than the sum of its proper divisors (7402469007).

20778973233 is a wasteful number, since it uses less digits than its factorization.

20778973233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27408.

The product of its (nonzero) digits is 2667168, while the sum is 51.

The spelling of 20778973233 in words is "twenty billion, seven hundred seventy-eight million, nine hundred seventy-three thousand, two hundred thirty-three".