20806673328 has 60 divisors (see below), whose sum is σ = 66548331408. Its totient is φ = 5944763520.

The previous prime is 20806673309. The next prime is 20806673401. The reversal of 20806673328 is 82337660802.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10319763 + ... + 10321778.

Almost surely, 2^20806673328 is an apocalyptic number.

20806673328 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20806673328 is an abundant number, since it is smaller than the sum of its proper divisors (45741658080).

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

20806673328 is a wasteful number, since it uses less digits than its factorization.

20806673328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20641562 (or 20641553 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The spelling of 20806673328 in words is "twenty billion, eight hundred six million, six hundred seventy-three thousand, three hundred twenty-eight".