20223256778 has 8 divisors (see below), whose sum is σ = 31380915780. Its totient is φ = 9762951520.

The previous prime is 20223256777. The next prime is 20223256787. The reversal of 20223256778 is 87765232202.

20223256778 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 18223110049 + 2000146729 = 134993^2 + 44723^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×20223256778³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (20223256777) 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 3 ways as a sum of consecutive naturals, for example, 174338363 + ... + 174338478.

Almost surely, 2^20223256778 is an apocalyptic number.

20223256778 is a deficient number, since it is larger than the sum of its proper divisors (11157659002).

20223256778 is a wasteful number, since it uses less digits than its factorization.

20223256778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348676872.

The product of its (nonzero) digits is 564480, while the sum is 44.

The spelling of 20223256778 in words is "twenty billion, two hundred twenty-three million, two hundred fifty-six thousand, seven hundred seventy-eight".