20777776000 has 64 divisors (see below), whose sum is σ = 51658785360. Its totient is φ = 8311104000.

The previous prime is 20777775979. The next prime is 20777776039. The reversal of 20777776000 is 67777702.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 633306 + ... + 665305.

Almost surely, 2^20777776000 is an apocalyptic number.

20777776000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20777776000 is an abundant number, since it is smaller than the sum of its proper divisors (30881009360).

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

20777776000 is an equidigital number, since it uses as much as digits as its factorization.

20777776000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298640 (or 1298618 counting only the distinct ones).

The product of its (nonzero) digits is 201684, while the sum is 43.

The spelling of 20777776000 in words is "twenty billion, seven hundred seventy-seven million, seven hundred seventy-six thousand".