20742578680 has 32 divisors (see below), whose sum is σ = 46719860400. Its totient is φ = 8288310016.

The previous prime is 20742578663. The next prime is 20742578707. The reversal of 20742578680 is 8687524702.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 233950 + ... + 310189.

Almost surely, 2^20742578680 is an apocalyptic number.

20742578680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20742578680 is an abundant number, since it is smaller than the sum of its proper divisors (25977281720).

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

20742578680 is a wasteful number, since it uses less digits than its factorization.

20742578680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545103 (or 545099 counting only the distinct ones).

The product of its (nonzero) digits is 1505280, while the sum is 49.

The spelling of 20742578680 in words is "twenty billion, seven hundred forty-two million, five hundred seventy-eight thousand, six hundred eighty".