20433686778 has 24 divisors (see below), whose sum is σ = 45912729408. Its totient is φ = 6811228764.

The previous prime is 20433686759. The next prime is 20433686783. The reversal of 20433686778 is 87768633402.

20433686778 is a `hidden beast` number, since 20 + 433 + 68 + 67 + 78 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 21021826 + ... + 21022797.

It is an arithmetic number, because the mean of its divisors is an integer number (1913030392).

Almost surely, 2^20433686778 is an apocalyptic number.

20433686778 is an abundant number, since it is smaller than the sum of its proper divisors (25479042630).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20433686778 is an equidigital number, since it uses as much as digits as its factorization.

20433686778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42044640 (or 42044628 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 54.

The spelling of 20433686778 in words is "twenty billion, four hundred thirty-three million, six hundred eighty-six thousand, seven hundred seventy-eight".