20779999929600 has 216 divisors, whose sum is σ = 68865282756480. Its totient is φ = 5518146600960.

The previous prime is 20779999929587. The next prime is 20779999929649. The reversal of 20779999929600 is 692999997702.

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 23 ways as a sum of consecutive naturals, for example, 2324592 + ... + 6853008.

Almost surely, 2^{20779999929600} is an apocalyptic number.

20779999929600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20779999929600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34432641378240).

20779999929600 is an abundant number, since it is smaller than the sum of its proper divisors (48085282826880).

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

20779999929600 is a wasteful number, since it uses less digits than its factorization.

20779999929600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4528685 (or 4528666 counting only the distinct ones).

The product of its (nonzero) digits is 624974616, while the sum is 78.

The spelling of 20779999929600 in words is "twenty trillion, seven hundred seventy-nine billion, nine hundred ninety-nine million, nine hundred twenty-nine thousand, six hundred".