20673639028 has 12 divisors (see below), whose sum is σ = 41347278112. Its totient is φ = 8860131000.

The previous prime is 20673639023. The next prime is 20673639043. The reversal of 20673639028 is 82093637602.

20673639028 is an admirable number.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20673639023) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 369172098 + ... + 369172153.

Almost surely, 2^20673639028 is an apocalyptic number.

20673639028 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20673639028 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20673639028 is a wasteful number, since it uses less digits than its factorization.

20673639028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738344262 (or 738344260 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 46.

The spelling of 20673639028 in words is "twenty billion, six hundred seventy-three million, six hundred thirty-nine thousand, twenty-eight".