20667273984 has 144 divisors (see below), whose sum is σ = 69847895040. Its totient is φ = 5904921600.

The previous prime is 20667273947. The next prime is 20667274027. The reversal of 20667273984 is 48937276602.

It is a tau number, because it is divible by the number of its divisors (144).

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

It is a self number, because there is not a number n which added to its sum of digits gives 20667273984.

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 15 ways as a sum of consecutive naturals, for example, 165192 + ... + 261959.

Almost surely, 2^20667273984 is an apocalyptic number.

20667273984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20667273984 is an abundant number, since it is smaller than the sum of its proper divisors (49180621056).

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

20667273984 is an equidigital number, since it uses as much as digits as its factorization.

20667273984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427183 (or 427163 counting only the distinct ones).

The product of its (nonzero) digits is 6096384, while the sum is 54.

The spelling of 20667273984 in words is "twenty billion, six hundred sixty-seven million, two hundred seventy-three thousand, nine hundred eighty-four".