20172776960 has 80 divisors (see below), whose sum is σ = 55277060256. Its totient is φ = 6916374528.

The previous prime is 20172776873. The next prime is 20172777011. The reversal of 20172776960 is 6967727102.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 544937 + ... + 580776.

Almost surely, 2^20172776960 is an apocalyptic number.

20172776960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20172776960 is an abundant number, since it is smaller than the sum of its proper divisors (35104283296).

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

20172776960 is an equidigital number, since it uses as much as digits as its factorization.

20172776960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1125743 (or 1125727 counting only the distinct ones).

The product of its (nonzero) digits is 444528, while the sum is 47.

The spelling of 20172776960 in words is "twenty billion, one hundred seventy-two million, seven hundred seventy-six thousand, nine hundred sixty".