20518672000 has 64 divisors (see below), whose sum is σ = 51014588040. Its totient is φ = 8207462400.

The previous prime is 20518671989. The next prime is 20518672007. The reversal of 20518672000 is 27681502.

It can be written as a sum of positive squares in 4 ways, for example, as 6460301376 + 14058370624 = 80376^2 + 118568^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20518672007) by changing a digit.

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, 625209 + ... + 657208.

Almost surely, 2^20518672000 is an apocalyptic number.

20518672000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20518672000 is an abundant number, since it is smaller than the sum of its proper divisors (30495916040).

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

20518672000 is an equidigital number, since it uses as much as digits as its factorization.

20518672000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282446 (or 1282424 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The spelling of 20518672000 in words is "twenty billion, five hundred eighteen million, six hundred seventy-two thousand".